Year	Number of
1990	1382.26
1991	1386.11
1992	1425.89
1993	1463.17
1994	1495.7
1995	1524.74
1996	1541.97
1997	1540.72
1998	1528.93
1999	1517.4
2000	1519.3
2001	1512.62
2002	1500.72
2003	1475.65
2004	1451.71
2005	1420.52
2006	1392.77
2007	1370.65
2008	1350.19
2009	1326.92
2010	1310.45
2011	1284.79
2012	1260.01
2013	1240.16
2014	1215.67
2015	1202.26
2016	1196.1