Year	Number of
1990	463.63
1991	483.84
1992	502.17
1993	508.86
1994	526.54
1995	549.43
1996	571.91
1997	564.45
1998	573.32
1999	581.68
2000	589.22
2001	602.13
2002	603.55
2003	635.99
2004	639.07
2005	652.36
2006	669.19
2007	689.1
2008	727.55
2009	755.49
2010	789.17
2011	830.36
2012	874.06
2013	911.24
2014	954.49
2015	1003.26
2016	1051.23