Year	Number of
1990	102.32
1991	106.2
1992	109.66
1993	112.58
1994	115.56
1995	119.52
1996	122.8
1997	127.06
1998	131.84
1999	137.21
2000	142.73
2001	148.36
2002	154.39
2003	160.19
2004	166.13
2005	172.03
2006	177.53
2007	182.31
2008	186.71
2009	191.2
2010	195.18
2011	198.49
2012	201.4
2013	204.43
2014	207.23
2015	209.89
2016	213.01