Year	Number of
1990	70.15
1991	72.94
1992	74.21
1993	80.1
1994	83.71
1995	89.24
1996	94.2
1997	96.58
1998	99.39
1999	102.88
2000	106.7
2001	110.71
2002	115.98
2003	121.82
2004	130.86
2005	136.1
2006	140.95
2007	145.54
2008	150.98
2009	157.12
2010	162.23
2011	167.74
2012	175.14
2013	180.98
2014	187.52
2015	194.16
2016	200.97