Year	Number of
1990	126.29
1991	125.86
1992	128.11
1993	130.59
1994	134.61
1995	134.96
1996	133.71
1997	133.19
1998	146.76
1999	155.23
2000	181.54
2001	180.4
2002	186.95
2003	203.25
2004	202.98
2005	205.26
2006	201.13
2007	202.87
2008	213.6
2009	211.85
2010	216.88
2011	209.91
2012	209.89
2013	211.57
2014	207.85
2015	203.73
2016	198.38