National League average attendance 1998 - present:
1998: 2,401,674
1999: 2,380,436
2000: 2,480,194
2001: 2,481,346
2002: 2,309,294
2003: 2,273,813
2004: 2,512,690
2005: 2,583,685
2006: 2,598,741
2007: 2,756,384
2008: 2,755,082
2009: 2,571,627
2010: 2,563,111
2011: 2,547,018
2012: 2,592,218
2013: 2,629,060
2014: 2,615,565
2015: 2,593,535
2016: 2,540,903
2017: 2,553,787
American League average attendance 1998 - present
1998: 2,298,169
1999: 2,286,874
2000: 2,262,557
2001: 2,346,071
2002: 2,207,891
2003: 2,191,745
2004: 2,340,422
2005: 2,360,452
2006: 2,458,741
2007: 2,527,968
2008: 2,464,986
2009: 2,305,178
2010: 2,289,427
2011: 2,333,812
2012: 2,384,555
2013: 2,306,065
2014: 2,299,409
2015: 2,323,798
2016: 2,336,365
2017: 2,290,907
Attendance peaked in 2007 and have not recovered in either league.