How frequently do home run hitters hit home runs?

Through 2015 29 players have hit at least 490 Home Runs (HR). Expanding below 500 let's us include Lou Gehrig ... and Fred McGriff. Here are the top five showing their

HR as a percent of Hits:

First	Last	Bats	HR%	AB	H	HR	BB	SO
Barry	Bonds	L	26.0	9847	2935	762	2558	1539
Hank	Aaron	R	20.0	12364	3771	755	1402	1383
Babe	Ruth	L	24.9	8398	2873	714	2062	1330
Alex	Rodriguez	R	22.4	10341	3070	687	1324	2220
Willie	Mays	R	20.1	10881	3283	660	1464	1526

Now let's sort by HR%:

First	Last	Bats	HR%	AB	H	HR	BB	SO
Mark	McGwire	R	35.9	6187	1626	583	1317	1596
Harmon	Killebrew	R	27.5	8147	2086	573	1559	1699
Jim	Thome	L	26.3	8422	2328	612	1747	2548
Barry	Bonds	L	26.0	9847	2935	762	2558	1539
Sammy	Sosa	R	25.3	8813	2408	609	929	2306

Bonds is the only one still up there. The other's have these ranks:
Aaron 20
Ruth 6
Rodriguez 10
Mays 19
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AB/HR (lower is better):
Top five in HR:

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR
Barry	Bonds	L	26.0	9847	2935	762	2558	1539	12.9
Hank	Aaron	R	20.0	12364	3771	755	1402	1383	16.4
Babe	Ruth	L	24.9	8398	2873	714	2062	1330	11.8
Alex	Rodriguez	R	22.4	10341	3070	687	1324	2220	15.1
Willie	Mays	R	20.1	10881	3283	660	1464	1526	16.5

Sorted by AB/HR:

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR
Mark	McGwire	R	35.9	6187	1626	583	1317	1596	10.6
Babe	Ruth	L	24.9	8398	2873	714	2062	1330	11.8
Barry	Bonds	L	26.0	9847	2935	762	2558	1539	12.9
Jim	Thome	L	26.3	8422	2328	612	1747	2548	13.8
Harmon	Killebrew	R	27.5	8147	2086	573	1559	1699	14.2

Bonds and Ruth are still up there. The other's have these ranks:
Aaron 19
Rodriguez 10
Mays 20
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If a batter homers about every 16 at bats (AB) we tend to divide 16 by 4 per game and figure that he homers about once every four games. But what about bases on balls (BB)? Let's look at HR per plate appearance (PA). Note: Sacrifice Flies (SF) are omitted from PA because the data contains null values for years when that stat was not kept and it messes things up.

PA/HR:
Top five in HR:

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR	PA/HR
Barry	Bonds	L	26.0	9847	2935	762	2558	1539	12.9	16.4
Hank	Aaron	R	20.0	12364	3771	755	1402	1383	16.4	18.3
Babe	Ruth	L	24.9	8398	2873	714	2062	1330	11.8	14.7
Alex	Rodriguez	R	22.4	10341	3070	687	1324	2220	15.1	17.2
Willie	Mays	R	20.1	10881	3283	660	1464	1526	16.5	18.8

Sorted by PA/HR:

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR	PA/HR
Mark	McGwire	R	35.9	6187	1626	583	1317	1596	10.6	13.0
Babe	Ruth	L	24.9	8398	2873	714	2062	1330	11.8	14.7
Sammy	Sosa	R	25.3	8813	2408	609	929	2306	14.5	16.1
Barry	Bonds	L	26.0	9847	2935	762	2558	1539	12.9	16.4
Jim	Thome	L	26.3	8422	2328	612	1747	2548	13.8	16.7

Again, Bonds and Ruth are still up there despite walking more than 2,000 times. The other's have these ranks:
Aaron 13
Rodriguez 7
Mays 18

McGwire homered just a bit more than once every three games for his career, figuring about four PA per game.
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Finally, what percentage of their outs at least had a chance of being a home run, i.e., percent of non-SO outs? Again for database reasons Outs are simply AB - Hits.

Percent of non SO outs:
Top five in HR:

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR	PA/HR	nonSOouts%
Barry	Bonds	L	26.0	9847	2935	762	2558	1539	12.9	16.4	77.7
Hank	Aaron	R	20.0	12364	3771	755	1402	1383	16.4	18.3	83.9
Babe	Ruth	L	24.9	8398	2873	714	2062	1330	11.8	14.7	75.9
Alex	Rodriguez	R	22.4	10341	3070	687	1324	2220	15.1	17.2	69.5
Willie	Mays	R	20.1	10881	3283	660	1464	1526	16.5	18.8	79.9

Sorted by percent of non SO outs:

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR	PA/HR	nonSOouts%
Mel	Ott	L	17.8	9456	2876	511	1708	896	18.5	22.0	86.4
Ted	Williams	L	19.6	7706	2654	521	2021	709	14.8	18.7	86.0
Lou	Gehrig	L	18.1	8001	2721	493	1508	790	16.2	19.4	85.0
Hank	Aaron	R	20.0	12364	3771	755	1402	1383	16.4	18.3	83.9
Albert	Pujols	R	21.0	8545	2666	560	1165	978	15.3	17.5	83.4

Only Aaron remains. The other top five HR hitter ranks:
Bonds 12
Ruth 15
Rodriguez 23
Mays 10

Since this is a pretty unusual perspective, here are the bottom five;

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR	PA/HR	nonSOouts%
Manny	Ramirez	R	21.6	8244	2574	555	1329	1813	14.9	17.4	68.0
Mark	McGwire	R	35.9	6187	1626	583	1317	1596	10.6	13.0	65.0
Reggie	Jackson	L	21.8	9864	2584	563	1375	2597	17.5	20.1	64.3
Sammy	Sosa	R	25.3	8813	2408	609	929	2306	14.5	16.1	64.0
Jim	Thome	L	26.3	8422	2328	612	1747	2548	13.8	16.7	58.2

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Here are all 29 career leaders through 2015 with this new data sorted by HR.

First	Last	Bats	HR%	AB	H	HR	BB	SO	AB/HR	PA/HR	nonSOouts%
Barry	Bonds	L	26.0	9847	2935	762	2558	1539	12.9	16.4	77.7
Hank	Aaron	R	20.0	12364	3771	755	1402	1383	16.4	18.3	83.9
Babe	Ruth	L	24.9	8398	2873	714	2062	1330	11.8	14.7	75.9
Alex	Rodriguez	R	22.4	10341	3070	687	1324	2220	15.1	17.2	69.5
Willie	Mays	R	20.1	10881	3283	660	1464	1526	16.5	18.8	79.9
Ken	Griffey	L	22.7	9801	2781	630	1312	1779	15.6	17.8	74.7
Jim	Thome	L	26.3	8422	2328	612	1747	2548	13.8	16.7	58.2
Sammy	Sosa	R	25.3	8813	2408	609	929	2306	14.5	16.1	64.0
Frank	Robinson	R	19.9	10006	2943	586	1420	1532	17.1	19.8	78.3
Mark	McGwire	R	35.9	6187	1626	583	1317	1596	10.6	13.0	65.0
Harmon	Killebrew	R	27.5	8147	2086	573	1559	1699	14.2	17.0	72.0
Rafael	Palmeiro	L	18.8	10472	3020	569	1353	1348	18.4	20.9	81.9
Reggie	Jackson	L	21.8	9864	2584	563	1375	2597	17.5	20.1	64.3
Albert	Pujols	R	21.0	8545	2666	560	1165	978	15.3	17.5	83.4
Manny	Ramirez	R	21.6	8244	2574	555	1329	1813	14.9	17.4	68.0
Mike	Schmidt	R	24.5	8352	2234	548	1507	1883	15.2	18.1	69.2
Mickey	Mantle	B	22.2	8102	2415	536	1733	1710	15.1	18.4	69.9
Jimmie	Foxx	R	20.2	8134	2646	534	1452	1311	15.2	18.0	76.1
Willie	McCovey	L	23.6	8197	2211	521	1345	1550	15.7	18.4	74.1
Ted	Williams	L	19.6	7706	2654	521	2021	709	14.8	18.7	86.0
Frank	Thomas	R	21.1	8199	2468	521	1667	1397	15.7	19.1	75.6
Eddie	Mathews	L	22.1	8537	2315	512	1444	1487	16.7	19.5	76.1
Ernie	Banks	R	19.8	9421	2583	512	763	1236	18.4	20.0	81.9
Mel	Ott	L	17.8	9456	2876	511	1708	896	18.5	22.0	86.4
Gary	Sheffield	R	18.9	9217	2689	509	1475	1171	18.1	21.3	82.1
Eddie	Murray	B	15.5	11336	3255	504	1333	1516	22.5	25.2	81.2
David	Ortiz	L	21.8	8103	2303	503	1239	1664	16.1	18.6	71.3
Lou	Gehrig	L	18.1	8001	2721	493	1508	790	16.2	19.4	85.0
Fred	McGriff	L	19.8	8757	2490	493	1305	1882	17.8	20.5	70.0