Year	Number of
1990	529.95
1991	553.13
1992	581.92
1993	614.45
1994	649.36
1995	685.94
1996	723.75
1997	763.29
1998	808.1
1999	861.38
2000	926.45
2001	999.23
2002	1087.26
2003	1186.74
2004	1289.97
2005	1393.52
2006	1434.8
2007	1466.88
2008	1507.12
2009	1564.84
2010	1649.39
2011	1754.85
2012	1890.6
2013	2045.88
2014	2193.91
2015	2321.51
2016	2450.91