Year	Number of
1990	502.81
1991	535.03
1992	568.03
1993	600.69
1994	635.52
1995	672.92
1996	687.82
1997	700.1
1998	708.7
1999	716.25
2000	723.58
2001	750.61
2002	780.48
2003	817.8
2004	854.12
2005	889.15
2006	907.83
2007	923.44
2008	937.87
2009	956.19
2010	981.35
2011	1012.91
2012	1050.03
2013	1085.7
2014	1116.49
2015	1142.07
2016	1171.69