Year	Number of
1990	1113.21
1991	1092.01
1992	1064.46
1993	1041.26
1994	1014.28
1995	988.81
1996	957.66
1997	922.52
1998	881
1999	850.16
2000	820.03
2001	793.17
2002	777.6
2003	770.5
2004	764.31
2005	758
2006	751.58
2007	739.61
2008	741.42
2009	742.49
2010	727.36
2011	754.7
2012	770.94
2013	775.25
2014	780.38
2015	799.86
2016	818.39