Year	Number of
1990	824.24
1991	805.63
1992	772.38
1993	745.53
1994	712.23
1995	689.65
1996	677.31
1997	665.71
1998	652.39
1999	641.14
2000	617.84
2001	608.68
2002	600.61
2003	593.15
2004	585.47
2005	576.32
2006	561.38
2007	553.01
2008	542.69
2009	537.51
2010	528.41
2011	529.11
2012	525.94
2013	526.62
2014	525.17
2015	538.23
2016	553.1