Year	Number of
1990	1006.91
1991	1040.7
1992	1073.33
1993	1105.1
1994	1137.71
1995	1172.75
1996	1205.27
1997	1240.96
1998	1279.3
1999	1319.74
2000	1363.55
2001	1399.92
2002	1439.04
2003	1480.35
2004	1523.34
2005	1568.89
2006	1603.44
2007	1638.34
2008	1676.72
2009	1717.02
2010	1760.57
2011	1800.18
2012	1842.46
2013	1886.07
2014	1930.33
2015	1974.71
2016	2015.91