Year	Number of
1990	130.13
1991	126.91
1992	122.8
1993	120.2
1994	113.44
1995	107.85
1996	104.64
1997	101.81
1998	97.23
1999	96.41
2000	95.04
2001	93.5
2002	90.95
2003	91.34
2004	89.56
2005	87.72
2006	86.8
2007	85.15
2008	84.43
2009	84.52
2010	84.68
2011	83.92
2012	83.27
2013	82.24
2014	80.11
2015	79.33
2016	77.71