Year	Number of
1990	2372.66
1991	2523.11
1992	2673.43
1993	2733.34
1994	2914.18
1995	2985.26
1996	3126.26
1997	3134.21
1998	3140.85
1999	3246.28
2000	3170.57
2001	3282.83
2002	3519.56
2003	3570.55
2004	3491.98
2005	3584.16
2006	3660.65
2007	3685.17
2008	3801.15
2009	3884.54
2010	3950.39
2011	4037.89
2012	4083.37
2013	4212.29
2014	4290.77
2015	4392.92
2016	4485.72