Year	Number of
1990	2831.49
1991	2887.33
1992	2969.23
1993	3022.44
1994	3084.74
1995	3142.36
1996	3208.83
1997	3315.15
1998	3433.63
1999	3532.97
2000	3566.21
2001	3560.03
2002	3546.16
2003	3544.91
2004	3527.65
2005	3542.62
2006	3538.37
2007	3491.24
2008	3433.61
2009	3408
2010	3401.68
2011	3379.27
2012	3381.35
2013	3402.79
2014	3432.56
2015	3457.04
2016	3470.3