Year	Number of
1990	203.71
1991	206.91
1992	210.58
1993	214.06
1994	217.11
1995	223.69
1996	231.7
1997	238.26
1998	244.82
1999	261.51
2000	284.9
2001	318.1
2002	358.06
2003	401.78
2004	442.84
2005	479.34
2006	512.35
2007	539.18
2008	568.09
2009	602.29
2010	639.35
2011	650.74
2012	664.51
2013	683.17
2014	699.82
2015	726.49
2016	755.88