Year	Number of
1990	71.43
1991	73.57
1992	74.7
1993	74.37
1994	76.42
1995	79.63
1996	80.14
1997	79.12
1998	80.6
1999	80.36
2000	82.67
2001	89.3
2002	90.62
2003	94.49
2004	95.06
2005	95.33
2006	97.64
2007	99.97
2008	104.39
2009	105.15
2010	106.04
2011	106.14
2012	107.95
2013	112.89
2014	117.06
2015	117.89
2016	120.57