Year	Number of
1990	113.39
1991	117.06
1992	120.09
1993	123.46
1994	127.16
1995	130.8
1996	134.86
1997	138.19
1998	142.03
1999	146.63
2000	150.42
2001	153.95
2002	158.14
2003	161.71
2004	165.37
2005	169.41
2006	173.53
2007	177.13
2008	181.14
2009	184.57
2010	190.39
2011	194.87
2012	198.91
2013	202.23
2014	205.74
2015	209.66
2016	216.06