Year	Number of
1990	203.24
1991	202.16
1992	205.51
1993	206.22
1994	205.1
1995	208.65
1996	209.68
1997	212.04
1998	207.94
1999	205.08
2000	205
2001	203.52
2002	204.62
2003	205.55
2004	202.93
2005	203.79
2006	205.1
2007	205.61
2008	203.03
2009	206.57
2010	208.5
2011	211.1
2012	210.33
2013	213.37
2014	226.86
2015	227.28
2016	228.42