Year	Number of
1990	801.15
1991	870.74
1992	971.51
1993	1077.37
1994	1183.51
1995	1280.2
1996	1382.72
1997	1504.25
1998	1648.2
1999	1809.58
2000	1946
2001	2075.35
2002	2192.82
2003	2319.11
2004	2414.92
2005	2552.94
2006	2762.95
2007	2957.84
2008	3172.46
2009	3410.02
2010	3626.56
2011	3775.86
2012	3893.21
2013	3931.26
2014	4012.53
2015	4102.67
2016	4210.88