Year	Number of
1990	537.84
1991	561.02
1992	586.65
1993	614.88
1994	645.19
1995	677.71
1996	712.85
1997	750.15
1998	791.47
1999	836.18
2000	884.94
2001	939.77
2002	998.91
2003	1065.81
2004	1137.42
2005	1214.14
2006	1286.17
2007	1362.76
2008	1448.51
2009	1540.98
2010	1640.87
2011	1717.97
2012	1799.7
2013	1887.02
2014	1980.81
2015	2081.2
2016	2187.73