Year	Number of
1990	2142.94
1991	2145.33
1992	2152.34
1993	2162.94
1994	2185.21
1995	2218.8
1996	2263.31
1997	2299.19
1998	2318.69
1999	2331.2
2000	2362.87
2001	2335.95
2002	2302.69
2003	2279.5
2004	2280.53
2005	2286.95
2006	2278.89
2007	2259.41
2008	2243.2
2009	2217.35
2010	2187.16
2011	2163.03
2012	2126.85
2013	2089.91
2014	2059.14
2015	2035.55
2016	2034.18