Year	Number of
1990	83.82
1991	84.46
1992	83.62
1993	91.11
1994	93.21
1995	94.66
1996	97.29
1997	97.9
1998	99.52
1999	99.63
2000	98.66
2001	98
2002	98.27
2003	98.35
2004	98.46
2005	98.99
2006	99.32
2007	98.83
2008	98.31
2009	98.6
2010	100.59
2011	101.09
2012	100.64
2013	102.71
2014	104.14
2015	105.98
2016	108.1