Year	Number of
1990	269.96
1991	276.26
1992	281.92
1993	292.46
1994	303.26
1995	315.16
1996	330.05
1997	346.3
1998	363.55
1999	379.36
2000	392.79
2001	407.7
2002	430.37
2003	449.01
2004	463.26
2005	481.48
2006	512.53
2007	554.21
2008	607.6
2009	651.55
2010	701.68
2011	685.73
2012	670.74
2013	653.42
2014	641.66
2015	636.31
2016	637.06