Year	Number of
1990	1162.77
1991	1240.11
1992	1322.91
1993	1410.07
1994	1503.34
1995	1606.17
1996	1658.41
1997	1716.54
1998	1779.57
1999	1846.01
2000	1917.3
2001	1962.28
2002	2009.08
2003	2058.92
2004	2112.7
2005	2172.56
2006	2204.16
2007	2237.44
2008	2273.79
2009	2310.85
2010	2352.31
2011	2396.15
2012	2442.54
2013	2488.61
2014	2538.14
2015	2588.04
2016	2638.34