Year	Number of
1990	79.17
1991	78.92
1992	82.76
1993	84.94
1994	83.46
1995	86.31
1996	88.31
1997	91.19
1998	91.18
1999	93.99
2000	91.41
2001	89.37
2002	88.13
2003	88.09
2004	85.69
2005	87.81
2006	87.51
2007	88.21
2008	88.4
2009	87.41
2010	91.67
2011	90.59
2012	90.63
2013	91.18
2014	91.9
2015	92.73
2016	93.68