Year	Number of
1990	139.49
1991	135.1
1992	135.64
1993	147.12
1994	152.21
1995	144.01
1996	124.03
1997	120.97
1998	126.79
1999	125.11
2000	123.12
2001	130.6
2002	126.67
2003	131.06
2004	130.57
2005	131.14
2006	137.39
2007	131.16
2008	120.96
2009	114.28
2010	109.4
2011	105.19
2012	99.43
2013	103.33
2014	96.88
2015	94.81
2016	93.37