13. Home Run rates: PctDif greater than 40%.

42 occurrences in the 100 study years 1920-2019 dominated by Babe Ruth and those who played in the performance enhancing drugs (PED) years.

AB: At Bats

HR: Home Runs
MLB: Major League Baseball: both American League and National League
Home Run Rate: AB/HR (lower is better)
N: number of MLB teams that season
Top home run hitters: N hitters with the most HR, plus any ties at the bottom
Home Run Rate MLB: for N hitters: total AB / total HR
Home Run Rate hitters: AB/HR
Dif: Home Run Rate hitter - Home Run Rate MLB
PctDif: Dif/Home Run Rate MLB
HR#: rank among N hitters for HR
PctDif#: rank among N hitters for PctDif
Hitters are ranked by relative position: 1, 2, 3, ... Ties would have the same number and then rank number would resume. For example, if four players are tied at third place: 1, 2, 3, 3, 3, 3, 7, 8, ...

Among the 42 hitters who did it multiple times:
Ruth 11
McGwire 5: 1992, 1995, 1996, 1998, 1999
Bonds 4: 2001-2004
Gehrig 2: 1927, 1936
Foxx 2: 1932, 1933
Greenberg 2: 1938, 1946
Ted Williams 2: 1942, 1946
Kiner 2: 1947, 1949
York 2: 1937, 1943
Aaron 2: 1971, 1973

PctDif: 34 first; 8 second.
HR#: 25 first; lowest 5th:
York 1937
McGwire 1995

qryHomeRunsTopNyearPctDif

yearID	nameFirst	nameLast	PctDif	PctDif#	HR#	HR	AB	P_AB/HR	Group_ AB/HR	Dif	franchID	teamID	lgID
1920	Babe	Ruth	76.34%	1	1	54	457	8.462963	35.77	27.31	NYY	NYA	AL
1921	Babe	Ruth	69.08%	1	1	59	540	9.152542	29.60	20.45	NYY	NYA	AL
1926	Babe	Ruth	63.46%	1	1	47	495	10.53191	28.82	18.29	NYY	NYA	AL
1928	Babe	Ruth	57.54%	1	1	54	536	9.925926	23.38	13.45	NYY	NYA	AL
1927	Babe	Ruth	57.27%	1	1	60	540	9	21.06	12.06	NYY	NYA	AL
1924	Babe	Ruth	56.44%	1	1	46	529	11.5	26.40	14.90	NYY	NYA	AL
2001	Barry	Bonds	52.52%	1	1	73	476	6.520548	13.73	7.21	SFG	SFN	NL
1922	Babe	Ruth	51.76%	1	4	35	406	11.6	24.05	12.45	NYY	NYA	AL
1923	Babe	Ruth	51.15%	1	1	41	522	12.73171	26.06	13.33	NYY	NYA	AL
1933	Jimmie	Foxx	49.99%	1	1	48	573	11.9375	23.87	11.93	OAK	PHA	AL
1932	Jimmie	Foxx	49.98%	1	1	58	585	10.08621	20.16	10.08	OAK	PHA	AL
1923	Cy	Williams	49.93%	2	1	41	535	13.04878	26.06	13.01	PHI	PHI	NL
1998	Mark	McGwire	49.17%	1	1	70	509	7.271429	14.30	7.03	STL	SLN	NL
1946	Hank	Greenberg	48.31%	1	1	44	523	11.88636	23.00	11.11	DET	DET	AL
1931	Babe	Ruth	47.86%	1	1	46	534	11.6087	22.26	10.65	NYY	NYA	AL
1995	Mark	McGwire	45.95%	1	5	39	317	8.128205	15.04	6.91	OAK	OAK	AL
1949	Ralph	Kiner	45.73%	1	1	54	549	10.16667	18.73	8.57	PIT	PIT	NL
2004	Barry	Bonds	45.49%	1	4	45	373	8.288889	15.21	6.92	SFG	SFN	NL
1973	Hank	Aaron	45.38%	1	4	40	392	9.8	17.94	8.14	ATL	ATL	NL
1925	Rogers	Hornsby	45.24%	1	1	39	504	12.92308	23.60	10.68	STL	SLN	NL
1932	Babe	Ruth	44.72%	2	2	41	457	11.14634	20.16	9.02	NYY	NYA	AL
1944	Mel	Ott	44.31%	1	2	26	399	15.34615	27.55	12.21	SFG	NY1	NL
1938	Hank	Greenberg	44.04%	1	1	58	556	9.586206	17.13	7.54	DET	DET	AL
1942	Ted	Williams	43.78%	1	1	36	522	14.5	25.79	11.29	BOS	BOS	AL
2002	Barry	Bonds	43.75%	1	4	46	403	8.76087	15.57	6.81	SFG	SFN	NL
1933	Babe	Ruth	43.44%	2	2	34	459	13.5	23.87	10.37	NYY	NYA	AL
1981	Mike	Schmidt	42.81%	1	1	31	354	11.41935	19.97	8.55	PHI	PHI	NL
1976	Dave	Kingman	42.43%	1	2	37	474	12.81081	22.25	9.44	NYM	NYN	NL
1943	Charlie	Keller	41.81%	1	2	31	512	16.51613	28.39	11.87	NYY	NYA	AL
1971	Hank	Aaron	41.77%	1	2	47	495	10.53191	18.09	7.56	ATL	ATL	NL
1937	Rudy	York	41.57%	1	5	35	375	10.71429	18.34	7.62	DET	DET	AL
1996	Mark	McGwire	41.33%	1	1	52	423	8.134615	13.87	5.73	OAK	OAK	AL
2003	Barry	Bonds	41.30%	1	3	45	390	8.666667	14.76	6.10	SFG	SFN	NL
1946	Ted	Williams	41.18%	2	2	38	514	13.52632	23.00	9.47	BOS	BOS	AL
1971	Willie	Stargell	41.14%	2	1	48	511	10.64583	18.09	7.44	PIT	PIT	NL
1999	Mark	McGwire	41.12%	1	1	65	521	8.015385	13.61	5.60	STL	SLN	NL
1947	Ralph	Kiner	41.07%	1	1	51	565	11.07843	18.80	7.72	PIT	PIT	NL
1927	Lou	Gehrig	41.00%	2	2	47	584	12.42553	21.06	8.64	NYY	NYA	AL
1936	Lou	Gehrig	40.94%	1	1	49	579	11.81633	20.01	8.19	NYY	NYA	AL
1943	Rudy	York	40.84%	2	1	34	571	16.79412	28.39	11.59	DET	DET	AL
1992	Mark	McGwire	40.74%	1	2	42	467	11.11905	18.76	7.64	OAK	OAK	AL
2002	Jim	Thome	40.73%	2	2	52	480	9.230769	15.57	6.34	CLE	CLE	AL