Year	Number of
1990	338.71
1991	345.67
1992	361.1
1993	374.82
1994	395.6
1995	412.54
1996	420.47
1997	433.28
1998	448.93
1999	447.1
2000	439.22
2001	423.11
2002	410.06
2003	412.82
2004	410.34
2005	411.54
2006	411.39
2007	416.26
2008	421.11
2009	429.57
2010	433.68
2011	438.09
2012	444.3
2013	455.99
2014	464.86
2015	472.27
2016	477.82