Bats/Throws: Home Run rate

Home Run average (HRa): Home runs (HR) / at bats (AB).  Higher is better.

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 0.0030 0.0000 0.0023 0.0041 0.0011 0.0000
Max 0.0347 0.0511 0.0368 0.0391 0.0271 0.0554
Ave 0.0194 0.0118 0.0207 0.0214 0.0137 0.0125

Recent seasons:

Year	RR	RL	LR	LL	BR	BL
2000	0.0347	0.0214	0.0334	0.0391	0.0267	0.0377
2001	0.0323	0.0257	0.0358	0.0378	0.0263	0.0434
2002	0.0303	0.0225	0.0324	0.0357	0.0231	0.0554
2003	0.0324	0.0337	0.0339	0.0314	0.0240	0.0372
2004	0.0328	0.0170	0.0368	0.0340	0.0264	0.0441
2005	0.0310	0.0371	0.0329	0.0296	0.0238	0.0431
2006	0.0320	0.0417	0.0359	0.0318	0.0271	0.0542
2007	0.0302	0.0440	0.0327	0.0293	0.0224	0.0377
2008	0.0296	0.0511	0.0321	0.0305	0.0203	0.0386
2009	0.0313	0.0382	0.0331	0.0314	0.0219	0.0443
2010	0.0289	0.0271	0.0309	0.0281	0.0198	0.0305
2011	0.0288	0.0246	0.0246	0.0287	0.0232	0.0403
2012	0.0312	0.0396	0.0304	0.0282	0.0245	0.0327

Both historically and in recent seasons switch hitters hit the fewest HR per AB.  This is a reflection of the size of the batters.  Switch hitters are smaller than one siders: shorter and lighter.  And the gap has been increasing in recent seasons.  Remember, there are very few RL and BL batters.  See this post:

Wednesday, February 13, 2013
Batters Height & Weight 1903-2012