Year	Number of
1990	870.27
1991	900.91
1992	947.76
1993	987.71
1994	1040.45
1995	1074.75
1996	1088.2
1997	1140.09
1998	1168.25
1999	1170.06
2000	1196.54
2001	1180.78
2002	1296.82
2003	1314.03
2004	1309.67
2005	1295.07
2006	1276.13
2007	1285.23
2008	1305.99
2009	1322.65
2010	1348.95
2011	1382.01
2012	1409.28
2013	1442.73
2014	1481.27
2015	1521.94
2016	1568.1