Year	Number of
1990	424.2
1991	443.75
1992	472.37
1993	502.6
1994	527.93
1995	546.3
1996	562.06
1997	575
1998	584.14
1999	600.41
2000	608.79
2001	626.5
2002	650.1
2003	675.81
2004	701.67
2005	721.57
2006	731.22
2007	745.72
2008	775.76
2009	816.7
2010	848.75
2011	871.97
2012	890.32
2013	899.37
2014	909.59
2015	948.5
2016	985.53