Year	Number of
1990	516.03
1991	671.08
1992	875.64
1993	1144.87
1994	1500.8
1995	1972.72
1996	2287.39
1997	2654.25
1998	3082.22
1999	3582.63
2000	4169.65
2001	3832.02
2002	3523.06
2003	3240.47
2004	2982.6
2005	2749.81
2006	3049.11
2007	3384.3
2008	3768.58
2009	4198.11
2010	4677.35
2011	4799.38
2012	4926.24
2013	5054.2
2014	5186.53
2015	5325.38
2016	5471.24