Year	Number of
1990	75.42
1991	77.86
1992	80.24
1993	83.18
1994	86.63
1995	90.47
1996	94.02
1997	97.97
1998	103.32
1999	108.39
2000	110.36
2001	111.99
2002	114.69
2003	115.3
2004	115.84
2005	116.77
2006	117.04
2007	116.72
2008	117.27
2009	118.42
2010	117.16
2011	116.2
2012	115.75
2013	114.73
2014	113.66
2015	113.39
2016	114.1