Year	Number of
1990	427.07
1991	448.63
1992	470.68
1993	494.14
1994	518.46
1995	543.95
1996	568.14
1997	593.43
1998	622.31
1999	651.42
2000	681.01
2001	712.04
2002	745.35
2003	784.97
2004	828.46
2005	877.02
2006	917.84
2007	961.61
2008	1010.39
2009	1066.22
2010	1130.57
2011	1191.5
2012	1260.19
2013	1333.99
2014	1415.32
2015	1504.5
2016	1600.2