Year	Number of
1990	2262.04
1991	2226.97
1992	2231.36
1993	2243.09
1994	2258.11
1995	2268.07
1996	2227.19
1997	2195.97
1998	2178.57
1999	2208.14
2000	2221.46
2001	2249.95
2002	2271.25
2003	2288.69
2004	2311.8
2005	2325.89
2006	2337.08
2007	2335.02
2008	2351.1
2009	2354.85
2010	2368.6
2011	2404.54
2012	2446.19
2013	2456.85
2014	2443.61
2015	2435.44
2016	2444.24