Year	Number of
1990	407.12
1991	411.11
1992	433.09
1993	458.3
1994	472
1995	485.1
1996	515.51
1997	537.58
1998	550.29
1999	549.37
2000	543.4
2001	540.21
2002	539.22
2003	546.93
2004	556.02
2005	565.83
2006	575.09
2007	592.29
2008	606.65
2009	620.54
2010	644.68
2011	661.59
2012	681.67
2013	698.71
2014	719.9
2015	742.16
2016	764.23