Year	Number of
1990	113.7
1991	114.22
1992	111.93
1993	112.89
1994	115.52
1995	115.71
1996	114.44
1997	114.02
1998	113.05
1999	115.14
2000	113.87
2001	113.07
2002	114.67
2003	113.83
2004	114.15
2005	114.78
2006	117.41
2007	117.69
2008	117.85
2009	119.71
2010	122.87
2011	121.5
2012	124.56
2013	121.84
2014	122.57
2015	121.75
2016	120.75