Year	Number of
1990	1104.24
1991	1119.51
1992	1136.68
1993	1155.86
1994	1176.86
1995	1199.79
1996	1229.64
1997	1261.74
1998	1294.31
1999	1326.9
2000	1359.07
2001	1373.22
2002	1386.31
2003	1402.23
2004	1419.25
2005	1438.48
2006	1446.98
2007	1456.98
2008	1470.77
2009	1485.99
2010	1502.37
2011	1526.44
2012	1552.35
2013	1577.62
2014	1605.06
2015	1634.84
2016	1662.36