Year	Number of
1990	89.72
1991	88.92
1992	90.77
1993	93.22
1994	91.82
1995	94
1996	90.82
1997	88.45
1998	86.68
1999	84.55
2000	88.67
2001	89.49
2002	91.01
2003	94.69
2004	96.17
2005	96.99
2006	98.08
2007	100.26
2008	98.91
2009	97.34
2010	96.96
2011	99.44
2012	102.45
2013	107.99
2014	113.88
2015	118.82
2016	123.91