Year	Number of
1990	93.1
1991	94.13
1992	94.93
1993	95.43
1994	96.47
1995	98.35
1996	99.98
1997	102.4
1998	105.36
1999	108.28
2000	110.94
2001	111.65
2002	112.11
2003	112.83
2004	113.7
2005	114.88
2006	118.05
2007	121.47
2008	125.22
2009	129.18
2010	133.34
2011	135.35
2012	137.42
2013	139.54
2014	141.82
2015	144.32
2016	146.65