Year	Number of
1990	819.78
1991	802.15
1992	786.42
1993	771.72
1994	760.31
1995	750.74
1996	744.85
1997	736.4
1998	718.32
1999	708.56
2000	692.68
2001	671.33
2002	657.67
2003	648.58
2004	643.16
2005	634.08
2006	619.44
2007	606.82
2008	593.77
2009	584.1
2010	572.85
2011	568.82
2012	558.25
2013	547.15
2014	539.22
2015	542.05
2016	549.02