Year	Number of
1990	1980.08
1991	1968.89
1992	1952.33
1993	1926.37
1994	1897.81
1995	1890.43
1996	1861.61
1997	1877.62
1998	1886.59
1999	1864.24
2000	1847.04
2001	1808.08
2002	1779.61
2003	1756.58
2004	1742.17
2005	1754.71
2006	1741.97
2007	1751.78
2008	1744.95
2009	1742.44
2010	1733.53
2011	1720.11
2012	1717.96
2013	1705.32
2014	1700.73
2015	1715.23
2016	1734.66