Year	Number of
1990	93.11
1991	95.43
1992	97.95
1993	100.7
1994	103.59
1995	106.76
1996	109.79
1997	113.09
1998	116.76
1999	120.55
2000	124.55
2001	128.5
2002	132.73
2003	137.61
2004	142.59
2005	147.8
2006	152.92
2007	158.12
2008	164.01
2009	170.21
2010	176.91
2011	183.11
2012	189.78
2013	196.75
2014	204.05
2015	211.69
2016	219.02