Year	Number of
1990	1688.66
1991	1681.19
1992	1669.01
1993	1649.98
1994	1639.48
1995	1636.01
1996	1641.47
1997	1648.41
1998	1656.06
1999	1668.66
2000	1664.6
2001	1675.43
2002	1695.83
2003	1717.37
2004	1734.36
2005	1743.39
2006	1744.54
2007	1777.04
2008	1773.04
2009	1786.49
2010	1807.57
2011	1808.97
2012	1814.67
2013	1815.29
2014	1796.23
2015	1807.1
2016	1821.61