Year	Number of
1990	2537.31
1991	2540.75
1992	2474.31
1993	2395.33
1994	2366.82
1995	2333.08
1996	2266.12
1997	2201.9
1998	2180.13
1999	2214.48
2000	2187.72
2001	2150.99
2002	2098.61
2003	2085.41
2004	2062.39
2005	2059.39
2006	2064.51
2007	2068.64
2008	2049.51
2009	2040.98
2010	1992.88
2011	1990.16
2012	2025.48
2013	2016.16
2014	1979.02
2015	1959.22
2016	1951.05