Year	Number of
1990	102.74
1991	105.48
1992	108.3
1993	111.07
1994	113.99
1995	117.1
1996	120.07
1997	123.21
1998	126.37
1999	129.74
2000	133.4
2001	136.1
2002	139.03
2003	142.17
2004	145.61
2005	149.43
2006	154.35
2007	159.57
2008	165.24
2009	171.39
2010	178.12
2011	185.2
2012	192.81
2013	200.56
2014	208.86
2015	217.78
2016	229.15