Year	Number of
1990	537.9
1991	555.91
1992	581.58
1993	604.92
1994	619.9
1995	635.83
1996	658.69
1997	677.77
1998	712.06
1999	725.14
2000	757.96
2001	728.56
2002	771.42
2003	798.44
2004	821.05
2005	833.91
2006	846.12
2007	858.57
2008	873.51
2009	891.92
2010	904.53
2011	921.16
2012	940.97
2013	952.77
2014	974.08
2015	996.87
2016	1019.5