Year	Number of
1990	523.77
1991	538.96
1992	547.63
1993	567.19
1994	574.91
1995	589.57
1996	596.78
1997	611.7
1998	633.64
1999	652.47
2000	673.4
2001	689.23
2002	721.08
2003	750.95
2004	775.41
2005	820.81
2006	838.66
2007	856.33
2008	875.22
2009	897.4
2010	917.99
2011	932.59
2012	945.77
2013	952.85
2014	953.95
2015	950.84
2016	953.04