Year	Number of
1990	532.26
1991	542.03
1992	545.9
1993	538.19
1994	537.97
1995	536.68
1996	525.18
1997	514.46
1998	515.76
1999	520.57
2000	530.26
2001	531.56
2002	540.92
2003	558.31
2004	579.06
2005	601.2
2006	622.4
2007	636.94
2008	646.36
2009	658.88
2010	682.26
2011	703.21
2012	736.01
2013	763.56
2014	803.03
2015	846.3
2016	891.82