Year	Number of
1990	267.85
1991	295.81
1992	327.05
1993	362.32
1994	401.56
1995	445.4
1996	462.43
1997	480.73
1998	500.77
1999	522.06
2000	544.65
2001	575.92
2002	608.95
2003	644.91
2004	683.06
2005	723.61
2006	765.28
2007	808.57
2008	856.71
2009	907.98
2010	963.15
2011	1025.25
2012	1094.28
2013	1169.67
2014	1250.97
2015	1338.14
2016	1425.56