My opinion:
2016: 5803 (or 5895 - thanks bkahl)
2015: 5460 (or 5406 - thanks BrennanB)
2014: 5172
2013: 4488
2012: 3990 (or 4039)
2011: 3476 (or 3539)
2010: 3310 (with 3132 on the upswing)
2009: 2826
2008: 2481
2007: 2056
2006: 1717 (
)
2005: 1678
2004: 1318 (or 1241 - thanks Chris_is_me)
2003: 1114
2002: 987
2001: 494 (or 610 - thanks Chris_is_me)
2000: 469
1999: 254
1998: 195 (or 180)
1997: 67
1996: 71
1995: 177
1994: 144
1993: 151
1992: 111 (or 148)
As more facts come to light, I will most likely end up editing my opinion!