1997: 31,525

1998: 30,253

1999: 35,760

2000: 40,876

2001: 41,011

2002: 38,770

2003: 40,806

2004: 44,544

2005: 39,791
2006: 37,579
2007: 37,892
2008: 35,118
2009: 33,788
2010: 33,391
2011: 29,154

Declining herd, some improvement in 2011