Year	Number of
1990	1408.32
1991	1446.37
1992	1513.3
1993	1589.86
1994	1642.59
1995	1676.91
1996	1732.04
1997	1775.78
1998	1813.43
1999	1853.41
2000	1863.25
2001	1847.49
2002	1846.07
2003	1853.23
2004	1855.87
2005	1863.7
2006	1863.78
2007	1904.59
2008	1955.51
2009	2038.55
2010	2113.02
2011	2159.29
2012	2179.28
2013	2186.61
2014	2192.98
2015	2230.11
2016	2273.51