Year	Number of
1990	243.91
1991	255.57
1992	267.75
1993	280.85
1994	294.91
1995	310.11
1996	325.23
1997	341.61
1998	359.72
1999	378.92
2000	399.24
2001	416.23
2002	434.24
2003	454
2004	474.82
2005	496.83
2006	525.74
2007	556.62
2008	590.29
2009	626.23
2010	664.71
2011	696.88
2012	730.75
2013	766.4
2014	804.35
2015	844.85
2016	886.31