Year	Number of
1990	148
1991	152.43
1992	157.17
1993	162.32
1994	167.77
1995	173.64
1996	181.02
1997	188.93
1998	197.64
1999	206.78
2000	216.48
2001	225.02
2002	234.12
2003	244.51
2004	255.25
2005	266.46
2006	277.94
2007	289.83
2008	303.08
2009	317.13
2010	332.2
2011	346.91
2012	362.61
2013	379.14
2014	396.54
2015	414.8
2016	432.49