Year	Number of
1990	992.58
1991	1010.54
1992	1033.65
1993	1060.11
1994	1097.51
1995	1136.35
1996	1164.68
1997	1224.52
1998	1280.85
1999	1330.75
2000	1393.93
2001	1418.84
2002	1451.62
2003	1479.43
2004	1515.59
2005	1557.53
2006	1571.1
2007	1596.88
2008	1616.05
2009	1638.66
2010	1678
2011	1710.33
2012	1746.34
2013	1783.64
2014	1817.82
2015	1851.97
2016	1882.86