Year	Number of
1990	270.32
1991	287.99
1992	307.52
1993	328.45
1994	351.52
1995	377.09
1996	395.61
1997	414.94
1998	435.38
1999	455.76
2000	476.22
2001	484.47
2002	492.65
2003	502.38
2004	513.1
2005	525.15
2006	542.98
2007	562.54
2008	583.83
2009	606.66
2010	631.12
2011	664.33
2012	700.33
2013	738.38
2014	780.67
2015	827.83
2016	875.79