Year	Number of
1990	378.89
1991	397.32
1992	419.11
1993	431.1
1994	452.58
1995	479.68
1996	500.55
1997	527.81
1998	541.2
1999	554.02
2000	576.21
2001	579.55
2002	575.19
2003	567.8
2004	562.93
2005	564.82
2006	566.4
2007	571.41
2008	604.52
2009	636.98
2010	668.95
2011	687.58
2012	708.43
2013	724.53
2014	740.97
2015	761.16
2016	779.32