Year	Number of
1990	582.83
1991	614.35
1992	627.44
1993	653.05
1994	668.38
1995	693.08
1996	698.18
1997	708.65
1998	718.16
1999	749.97
2000	711.18
2001	695.32
2002	695.46
2003	728.69
2004	696.74
2005	705.05
2006	703.03
2007	686.78
2008	671.91
2009	741.51
2010	779.99
2011	811.74
2012	838.63
2013	892.9
2014	918.5
2015	946.14
2016	973.94