Year	Number of
1990	92.97
1991	94.14
1992	95.27
1993	96.28
1994	97.33
1995	98.55
1996	98.46
1997	98.62
1998	98.79
1999	98.85
2000	98.8
2001	99.72
2002	100.51
2003	101.14
2004	101.76
2005	102.48
2006	104.19
2007	105.92
2008	107.63
2009	109.44
2010	111.43
2011	113.43
2012	115.6
2013	117.99
2014	120.44
2015	122.98
2016	125.78