Year	Number of
1990	2164.49
1991	2221.36
1992	2297.58
1993	2408.43
1994	2404.38
1995	2421.42
1996	2379.83
1997	2316.55
1998	2289.81
1999	2253.39
2000	2161.38
2001	2121.49
2002	2118.5
2003	2011.72
2004	1987.55
2005	1938.39
2006	1837.5
2007	1716.77
2008	1685.9
2009	1645.51
2010	1616.54
2011	1576.63
2012	1453.62
2013	1379.56
2014	1314.94
2015	1308.04
2016	1310.34