Year	Number of
1990	1965.74
1991	1938.91
1992	1902.88
1993	1887.63
1994	1868.96
1995	1855.16
1996	1819.8
1997	1833.3
1998	1827.4
1999	1795.27
2000	1798.15
2001	1779.43
2002	1789.96
2003	1799.94
2004	1819.08
2005	1856.53
2006	1873.03
2007	1886.18
2008	1891.57
2009	1898.02
2010	1892.05
2011	1902.07
2012	1888.42
2013	1861.09
2014	1823.49
2015	1819.31
2016	1821.6