Year	Number of
1990	93.29
1991	96.33
1992	99.56
1993	103
1994	106.65
1995	111.25
1996	114.08
1997	116.81
1998	118.4
1999	116.09
2000	113.56
2001	111.7
2002	110.25
2003	109.14
2004	110.07
2005	110.36
2006	110.84
2007	112.1
2008	113.33
2009	115.33
2010	117.71
2011	119.51
2012	121.54
2013	124.49
2014	127.11
2015	130.21
2016	133