Year	Number of
1990	1130.7
1991	1151.35
1992	1187.79
1993	1211.08
1994	1239.56
1995	1268.01
1996	1292.02
1997	1335.29
1998	1385.58
1999	1434.56
2000	1466.56
2001	1480.6
2002	1489.35
2003	1496.95
2004	1524.42
2005	1562.25
2006	1584.04
2007	1586.01
2008	1580.81
2009	1583.48
2010	1590.59
2011	1596.52
2012	1609.2
2013	1635.97
2014	1665.52
2015	1688.88
2016	1709.73