Year	Number of
1990	2281.38
1991	2259.34
1992	2277.87
1993	2306.81
1994	2335.5
1995	2341.95
1996	2288.36
1997	2235.72
1998	2195.97
1999	2200.12
2000	2169.71
2001	2160.67
2002	2153.06
2003	2155.4
2004	2160.02
2005	2157.92
2006	2145.67
2007	2122.85
2008	2114.04
2009	2103.21
2010	2080.56
2011	2055.49
2012	2058.59
2013	2048.68
2014	2032.81
2015	2040.71
2016	2060.81