Year	Number of
1990	1225.7
1991	1317.26
1992	1329.09
1993	1483.22
1994	1542.06
1995	1501.87
1996	1387.93
1997	1302.77
1998	1302.41
1999	1271.54
2000	1240.56
2001	1310.34
2002	1295.47
2003	1284.39
2004	1279.61
2005	1350.69
2006	1362.01
2007	1398.72
2008	1301.7
2009	1180.2
2010	1189.73
2011	1155.58
2012	1133.14
2013	1128.25
2014	1071.53
2015	1052.11
2016	1041