Year	Number of
1990	92.5
1991	93.3
1992	93.13
1993	94.65
1994	100.27
1995	103.02
1996	109.24
1997	111.73
1998	115.11
1999	120.58
2000	124.77
2001	130.95
2002	128.96
2003	133.41
2004	135.67
2005	131.17
2006	132.47
2007	127.36
2008	128.72
2009	126.73
2010	121.25
2011	122
2012	120
2013	116.99
2014	116.93
2015	117.28
2016	117.47