Bats/Throws: percent of hits that are home runs

Click link to view data and graph.  HR%: home runs (HR) / Hits.

Definitions:
Both: switch hitters
RR: bats right, throws right
RL: bats right, throws left
LR: bats left, throws right
LL: bats left, throws left
BR: bats both, throws right
BL: bats both, throws left

For seasons 1903-2012 American and National Leagues:
             RR        RL       LR          LL       BR        BL
Min    1.26%   0.00%  0.90%    1.57%   0.44%   0.00%
Max 13.13% 20.85% 13.62% 14.15% 10.51% 21.13%
Ave   7.54%   5.44%   7.64%    7.94%   5.24%   5.02%

Recent seasons:

Year	RR	RL	LR	LL	BR	BL
2000	0.1290	0.0865	0.1232	0.1415	0.0985	0.1293
2001	0.1243	0.1176	0.1316	0.1410	0.0980	0.1490
2002	0.1177	0.1103	0.1218	0.1332	0.0878	0.2113
2003	0.1237	0.1450	0.1257	0.1177	0.0906	0.1372
2004	0.1239	0.0882	0.1362	0.1259	0.0999	0.1467
2005	0.1181	0.1555	0.1240	0.1100	0.0891	0.1718
2006	0.1194	0.2085	0.1318	0.1174	0.0998	0.1951
2007	0.1131	0.1934	0.1221	0.1092	0.0823	0.1406
2008	0.1137	0.1967	0.1207	0.1159	0.0737	0.1502
2009	0.1207	0.1536	0.1253	0.1181	0.0818	0.1709
2010	0.1121	0.1127	0.1201	0.1080	0.0773	0.1201
2011	0.1138	0.1124	0.0970	0.1105	0.0899	0.1460
2012	0.1221	0.1725	0.1207	0.1104	0.0963	0.1238

In recent seasons the three main groups (RR, LR, LL) are pretty close.  The next largest group (BR) is clearly behind in HR hitting.