Year	Number of
1990	241.61
1991	245.18
1992	245.45
1993	236.53
1994	232.69
1995	227.01
1996	224.97
1997	218.46
1998	218.72
1999	220.04
2000	216.67
2001	217.89
2002	214.48
2003	210.95
2004	205.5
2005	200.01
2006	203.25
2007	205.33
2008	205.99
2009	203.42
2010	200.8
2011	203.79
2012	204.87
2013	205
2014	210.07
2015	218.5
2016	225.47