Year	Number of
1990	109.95
1991	112.44
1992	115.05
1993	117.7
1994	120.56
1995	123.68
1996	126.45
1997	129.47
1998	132.59
1999	135.97
2000	139.67
2001	142.73
2002	146.06
2003	149.64
2004	153.6
2005	158.01
2006	162.2
2007	166.68
2008	171.58
2009	176.9
2010	182.74
2011	187.59
2012	192.87
2013	198.07
2014	203.66
2015	209.67
2016	217.83