Year	Number of
1990	1170.84
1991	1146.02
1992	1119.3
1993	1090.78
1994	1074.24
1995	1071.67
1996	1065.78
1997	1086.02
1998	1112.26
1999	1122.63
2000	1142.16
2001	1148.94
2002	1168.01
2003	1192.14
2004	1214.89
2005	1250.8
2006	1263.65
2007	1286.71
2008	1336.28
2009	1379.17
2010	1444.03
2011	1508.47
2012	1564.68
2013	1649.04
2014	1728.84
2015	1809.02
2016	1880.04