Year	Number of
1990	425.38
1991	412.11
1992	408.79
1993	408.81
1994	408.71
1995	401.73
1996	389.53
1997	371.25
1998	360.9
1999	357.53
2000	348.28
2001	349.16
2002	347.87
2003	351.78
2004	350.77
2005	350.81
2006	349.2
2007	347.82
2008	350.71
2009	348.1
2010	341.58
2011	337.22
2012	333.55
2013	331.68
2014	331.31
2015	334.42
2016	339.25