Year	Number of
1990	333.37
1991	336.69
1992	339.48
1993	341.96
1994	346.58
1995	349.32
1996	352.08
1997	358.95
1998	364.46
1999	372.79
2000	383.85
2001	398.47
2002	416.51
2003	438.98
2004	460.86
2005	483.94
2006	511.47
2007	545.68
2008	583.09
2009	616.45
2010	646.18
2011	665.99
2012	682.62
2013	696.69
2014	707.57
2015	715.56
2016	725.17