Year	Number of
1990	2313.16
1991	2283.24
1992	2292.36
1993	2292.11
1994	2330.86
1995	2352.89
1996	2277.65
1997	2164.82
1998	2046.46
1999	1962.34
2000	1882.42
2001	1849.96
2002	1822.3
2003	1834.5
2004	1890.88
2005	1933.44
2006	1935.14
2007	1907.54
2008	1815.12
2009	1740.7
2010	1696.53
2011	1668.62
2012	1640.87
2013	1582.96
2014	1523.96
2015	1496.43
2016	1542.39