Year	Number of
1990	86.39
1991	88.66
1992	91.1
1993	93.72
1994	96.55
1995	99.73
1996	103.3
1997	107.29
1998	111.59
1999	116.04
2000	120.67
2001	125.09
2002	129.68
2003	134.54
2004	139.63
2005	145.1
2006	149.81
2007	154.68
2008	159.98
2009	165.82
2010	172.38
2011	178.49
2012	185.4
2013	192.73
2014	200.58
2015	208.84
2016	216.31