Year	Number of
1990	1131.15
1991	1161.9
1992	1227.72
1993	1299.13
1994	1350.79
1995	1371.78
1996	1387.44
1997	1387.45
1998	1387.79
1999	1392.03
2000	1376.87
2001	1354.43
2002	1364.39
2003	1387.45
2004	1399.83
2005	1409.22
2006	1401.53
2007	1412.29
2008	1461.51
2009	1540.32
2010	1591.5
2011	1607.76
2012	1600.76
2013	1569.73
2014	1538.43
2015	1561.15
2016	1582.81