Year	Number of
1990	1301.36
1991	1327.15
1992	1339.71
1993	1345.87
1994	1341.82
1995	1295.97
1996	1296.5
1997	1260.45
1998	1262.37
1999	1283.35
2000	1284.82
2001	1309.63
2002	1329.14
2003	1374.09
2004	1376.1
2005	1327.09
2006	1373.92
2007	1378.56
2008	1393.54
2009	1409.19
2010	1428.19
2011	1462.87
2012	1481.26
2013	1467.67
2014	1466.68
2015	1460.45
2016	1492.04