Year	Number of
1990	95.88
1991	98.93
1992	102.42
1993	106.3
1994	110.44
1995	114.84
1996	120.21
1997	125.76
1998	131.49
1999	137.87
2000	145.17
2001	152.59
2002	160.86
2003	170.21
2004	180.6
2005	192.15
2006	201.82
2007	212.16
2008	223.55
2009	235.94
2010	249.48
2011	260.76
2012	272.64
2013	284.86
2014	298.07
2015	312.46
2016	329.26