Year	Number of
1990	115.68
1991	116.73
1992	122.5
1993	128.47
1994	130.25
1995	126.93
1996	121.54
1997	118.16
1998	115.5
1999	113.67
2000	116.22
2001	115.42
2002	116.55
2003	114.35
2004	114.99
2005	118.19
2006	118.99
2007	117.44
2008	113.43
2009	109.58
2010	106.31
2011	108.65
2012	112.04
2013	113.34
2014	112.21
2015	112.45
2016	113.87