Year	Number of
1990	300.29
1991	302.54
1992	305.15
1993	307.1
1994	309.3
1995	311.86
1996	306.39
1997	301.03
1998	295.39
1999	290.22
2000	285.65
2001	289.99
2002	295
2003	301.24
2004	307.82
2005	314.78
2006	319.87
2007	325.04
2008	331.58
2009	338.55
2010	346.1
2011	353.35
2012	361.11
2013	369.3
2014	377.61
2015	385.94
2016	394.44