Year	Number of
1990	434.61
1991	450.56
1992	468.85
1993	489.05
1994	509.53
1995	527.66
1996	542.05
1997	551.44
1998	560
1999	570.41
2000	579.79
2001	588.55
2002	597.28
2003	605.37
2004	617.11
2005	628.69
2006	638.97
2007	646.42
2008	654.2
2009	659.9
2010	665.2
2011	674.31
2012	690.58
2013	708.79
2014	726.33
2015	742.53
2016	762.48