Year	Number of
1990	843.13
1991	823.63
1992	809.93
1993	781.79
1994	774.21
1995	777.91
1996	777.25
1997	783.72
1998	763.91
1999	758.26
2000	755.21
2001	736.11
2002	736.86
2003	713.21
2004	708.78
2005	712.55
2006	707.39
2007	686.23
2008	665.77
2009	633.34
2010	616.66
2011	591.24
2012	570.64
2013	562.89
2014	560.58
2015	560.9
2016	560.54