41,349 - 19,459 in the National League and 21,890 in the American League:
1999 - 2893 in the NL and 2635 in the AL.
1998 - 2565 in the NL and 2499 in the AL.
1997 - 2163 in the NL and 2477 in the AL.
1996 - 2220 in the NL and 2742 in the AL.
1995 - 1917 in the NL and 2164 in the AL.
1994 - 1532 in the NL and 1774 in the AL.
1993 - 1956 in the NL and 2074 in the AL.
1992 - 1262 in the NL and 1776 in the AL.
1991 - 1430 in the NL and 1953 in the AL.
1990 - 1521 in the NL and 1796 in the AL.
The NL had 14 teams between 1990-1997 and 16 teams in 1998-1999. The AL had 14 teams for the entire decade.
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In the 2011 MLB season, there were 4552 home runs hit in 2429 MLB games for an average of 1.87 HRs per game.
There were more home runs, on average, hit in American League games than National League games. In 2011, there were 2271 home runs hit in 1134 AL games for an average of 2.00 HRs per game. There were 2281 home runs hit in 1295 NL games for an average of 1.76 HRs per game.
In 2009 Mark Teixeira and Carlos Pena had the most home runs in the American League with 39.