Year	Number of
1990	75.24
1991	78.16
1992	81.05
1993	83.84
1994	86.78
1995	90.03
1996	91.54
1997	93.18
1998	95.05
1999	97.13
2000	99.54
2001	94.39
2002	89.85
2003	86
2004	82.26
2005	78.59
2006	77.24
2007	75.7
2008	74.48
2009	73.49
2010	72.9
2011	74.74
2012	77.05
2013	79.65
2014	82.37
2015	85.1
2016	87.74