Year	Number of
1990	1362.6
1991	1380.62
1992	1378.72
1993	1365.11
1994	1356.9
1995	1357.01
1996	1357.7
1997	1368.95
1998	1396.65
1999	1415.14
2000	1453.2
2001	1466.42
2002	1499.76
2003	1536.38
2004	1561.01
2005	1588.32
2006	1624.17
2007	1652.26
2008	1673.62
2009	1690.24
2010	1715.47
2011	1739.65
2012	1754.68
2013	1779.57
2014	1816.5
2015	1833.56
2016	1849.13