Year	Number of
1990	93.98
1991	96.79
1992	100.02
1993	103.78
1994	108.04
1995	111.86
1996	116.01
1997	120.27
1998	125.9
1999	127.48
2000	132.01
2001	136.23
2002	138.82
2003	147.72
2004	149.88
2005	155.26
2006	161.06
2007	168.32
2008	179
2009	184.31
2010	191.89
2011	196.91
2012	202.81
2013	209.91
2014	217.34
2015	224.5
2016	232.09