Year	Number of
1990	421.67
1991	438.81
1992	456.23
1993	472.72
1994	493.57
1995	519.96
1996	543.82
1997	570.97
1998	599.91
1999	628.19
2000	655.13
2001	675.15
2002	694.82
2003	720.9
2004	749
2005	779.93
2006	797.24
2007	816.35
2008	839.33
2009	862.15
2010	884.08
2011	894.68
2012	903.83
2013	912.24
2014	921.11
2015	931.3
2016	941.85