Year	Number of
1990	222.99
1991	234.47
1992	246.94
1993	260.43
1994	274.8
1995	290.14
1996	302.44
1997	315.43
1998	329.36
1999	343.89
2000	359.16
2001	378.1
2002	398.2
2003	419.88
2004	442.85
2005	467.22
2006	490.25
2007	514.12
2008	539.74
2009	566.65
2010	595.08
2011	620.23
2012	646.99
2013	675.67
2014	705.64
2015	736.81
2016	769.6