Year	Number of
1990	504.67
1991	508.76
1992	518.4
1993	536.14
1994	548.72
1995	572.28
1996	572.78
1997	596.97
1998	614.37
1999	604.96
2000	608.09
2001	605.35
2002	614.97
2003	617.98
2004	615.51
2005	638.82
2006	650.37
2007	664.47
2008	675.46
2009	686.85
2010	696.48
2011	703.53
2012	703.44
2013	708.27
2014	713.58
2015	719.73
2016	727.79