Year	Number of
1990	443.57
1991	454.02
1992	473.49
1993	490.98
1994	512.57
1995	526.37
1996	530.66
1997	553.04
1998	565.52
1999	568.23
2000	573.87
2001	608.94
2002	616.94
2003	627.43
2004	628.63
2005	621.78
2006	613.95
2007	617.53
2008	627.58
2009	637.72
2010	649.52
2011	658.88
2012	669.11
2013	683.79
2014	701.73
2015	721.01
2016	739.14