Year	Number of
1990	74.54
1991	76.69
1992	79.52
1993	81.75
1994	84.97
1995	87.12
1996	89.66
1997	92.42
1998	95.43
1999	97.95
2000	99.93
2001	101.93
2002	103.83
2003	105.4
2004	107.43
2005	109.27
2006	112.03
2007	114.59
2008	115.11
2009	115.19
2010	115.25
2011	116.24
2012	117.35
2013	116.82
2014	115.71
2015	114.33
2016	115.7