Year	Number of
1990	222.56
1991	232.05
1992	242.18
1993	252.86
1994	264.25
1995	276.73
1996	290.2
1997	304.99
1998	320.91
1999	337.9
2000	356.33
2001	374.02
2002	393.34
2003	414.1
2004	436.21
2005	460.16
2006	479.35
2007	498.84
2008	519.8
2009	541.84
2010	565.6
2011	584.42
2012	604.76
2013	625.95
2014	647.94
2015	670.69
2016	694.35