Year	Number of
1990	1032.19
1991	1053.71
1992	1077.75
1993	1105.01
1994	1134.09
1995	1164.84
1996	1182.52
1997	1200.22
1998	1220.35
1999	1240.89
2000	1262.79
2001	1279.37
2002	1298.46
2003	1322.53
2004	1348.14
2005	1375.21
2006	1387.04
2007	1399.03
2008	1416.05
2009	1433.65
2010	1452.61
2011	1495.05
2012	1540.4
2013	1586.26
2014	1635.29
2015	1687.29
2016	1742.63