Year	Number of
1990	336.07
1991	344.75
1992	369.18
1993	383.45
1994	402.32
1995	405.74
1996	412.13
1997	423.31
1998	441.17
1999	453.36
2000	460.82
2001	468.42
2002	481.66
2003	513.73
2004	526.65
2005	545.01
2006	549.11
2007	548.64
2008	565.9
2009	578.66
2010	588.26
2011	587.14
2012	615.03
2013	593.89
2014	602.7
2015	616.44
2016	621.76