Year	Number of
1990	485.55
1991	491.79
1992	494.02
1993	493.45
1994	494.62
1995	500.59
1996	518.82
1997	544.41
1998	577.78
1999	617.22
2000	663.78
2001	702.1
2002	747.79
2003	802.95
2004	865.83
2005	937.64
2006	970.14
2007	1000.32
2008	1030.74
2009	1063.12
2010	1099.11
2011	1117.78
2012	1140.19
2013	1164.81
2014	1189.82
2015	1214.23
2016	1238.03