Year	Number of
1990	440.66
1991	446.62
1992	452.24
1993	457.51
1994	464.53
1995	474.4
1996	491.27
1997	511.97
1998	536
1999	561.1
2000	586.37
2001	605.76
2002	625.06
2003	646.13
2004	668.21
2005	691.99
2006	710.23
2007	729.48
2008	750.25
2009	772.35
2010	795.96
2011	810.07
2012	824.8
2013	839.47
2014	854.79
2015	870.84
2016	885.34