Year	Number of
1990	96.06
1991	98.54
1992	101.92
1993	108.16
1994	113.02
1995	122.49
1996	128.37
1997	131.43
1998	134.76
1999	137.44
2000	143.81
2001	147.2
2002	157.51
2003	161.83
2004	162.88
2005	163.7
2006	170.06
2007	176.14
2008	177.17
2009	182.52
2010	188.27
2011	188.6
2012	194.28
2013	198.49
2014	195.27
2015	197.39
2016	200.58