Year	Number of
1990	317.1
1991	336.34
1992	362.19
1993	394.28
1994	428.19
1995	457.17
1996	475.81
1997	490.34
1998	502.28
1999	516.33
2000	534.88
2001	554.16
2002	568.35
2003	585.18
2004	603.11
2005	616.65
2006	627.73
2007	633.77
2008	641.73
2009	646.49
2010	653.88
2011	661.33
2012	671.59
2013	686.56
2014	701.83
2015	717.76
2016	736.59