Year	Number of
1990	1362.41
1991	1467.24
1992	1554.77
1993	1659.9
1994	1741.93
1995	1827.18
1996	1941.12
1997	2004.2
1998	2092.71
1999	2192.55
2000	2286.28
2001	2337.95
2002	2397.2
2003	2411.5
2004	2479.15
2005	2514.3
2006	2579.49
2007	2584.79
2008	2655.85
2009	2711.33
2010	2741.82
2011	2762.99
2012	2840.43
2013	2925.68
2014	3062.82
2015	3201.04
2016	3359.34