Year	Number of
1990	107.15
1991	110.64
1992	114.21
1993	118.78
1994	123.49
1995	128.51
1996	133.47
1997	138.52
1998	144.06
1999	149.08
2000	152.5
2001	160.84
2002	165.67
2003	170.16
2004	174.54
2005	175.33
2006	175.72
2007	178.94
2008	187.48
2009	193.95
2010	200.26
2011	201.72
2012	201.82
2013	200
2014	199.09
2015	200.06
2016	203.26