Year	Number of
1990	204.58
1991	220.02
1992	229.77
1993	241.81
1994	256.7
1995	262.78
1996	267.23
1997	263.65
1998	264.64
1999	265.17
2000	265.36
2001	263.66
2002	263.84
2003	263.04
2004	263.3
2005	266.48
2006	268.93
2007	269.48
2008	267.06
2009	269.48
2010	267.34
2011	263.86
2012	257.23
2013	256.5
2014	261.29
2015	268.99
2016	276.16