Year	Number of
1990	375.35
1991	364.98
1992	364.34
1993	364.53
1994	367.94
1995	369.32
1996	360.24
1997	348.9
1998	338.02
1999	332.64
2000	337.49
2001	336.53
2002	341.07
2003	341.08
2004	347.8
2005	354.68
2006	354.37
2007	362.91
2008	368.16
2009	379.24
2010	388.41
2011	391.74
2012	399.19
2013	404.25
2014	409.85
2015	416.56
2016	425.36