Year	Number of
1990	121.74
1991	117.42
1992	111.42
1993	105.15
1994	100.36
1995	97.95
1996	102.01
1997	108.07
1998	116.6
1999	123.93
2000	129.63
2001	132.75
2002	135.51
2003	136.38
2004	137.45
2005	139.02
2006	142.66
2007	146.46
2008	150.33
2009	154.51
2010	159.19
2011	164.03
2012	169.67
2013	176.63
2014	184.16
2015	192.16
2016	200.54