Year	Number of
1990	1708.23
1991	1783.34
1992	1868.35
1993	1941.8
1994	2036.31
1995	2152.76
1996	2252.65
1997	2428.17
1998	2604.77
1999	2544.51
2000	2583.37
2001	2621.51
2002	2618.5
2003	2634.84
2004	2707.18
2005	2793.09
2006	2860
2007	2978.21
2008	3105.98
2009	3212.93
2010	3360.17
2011	3514.86
2012	3637.61
2013	3752.19
2014	3901.37
2015	4037.92
2016	4174.13