Year	Number of
1990	471.17
1991	439.59
1992	421.48
1993	407.78
1994	390.86
1995	375.21
1996	367.21
1997	359.25
1998	346.18
1999	372.04
2000	399.5
2001	437.92
2002	481.55
2003	528.81
2004	584.26
2005	631.93
2006	669.36
2007	692.9
2008	709.63
2009	732.49
2010	767.82
2011	805.55
2012	850.87
2013	906.82
2014	959.38
2015	1003.34
2016	1057.79