Year	Number of
1990	84.89
1991	85.73
1992	88.52
1993	89.42
1994	90.88
1995	92.26
1996	94.58
1997	96.02
1998	97.13
1999	97.43
2000	98.22
2001	96.95
2002	95.74
2003	96.15
2004	98.21
2005	99.17
2006	102.01
2007	103.16
2008	106.32
2009	109.75
2010	108.21
2011	107.88
2012	106.46
2013	103
2014	101.37
2015	101.28
2016	101.33