Year	Number of
1990	85.79
1991	85.89
1992	85.68
1993	91.99
1994	94.24
1995	96.41
1996	98.55
1997	99.97
1998	101.1
1999	100.81
2000	100.68
2001	100.19
2002	99.77
2003	99.86
2004	99.92
2005	100.07
2006	99.84
2007	99.59
2008	99.47
2009	99.99
2010	100.51
2011	100.74
2012	100.85
2013	102.9
2014	104.85
2015	106.82
2016	109.28