Year	Number of
1990	1018.95
1991	1014.52
1992	997.28
1993	1029.44
1994	1062.59
1995	1068.13
1996	1090.39
1997	1113.7
1998	1102.64
1999	1113.91
2000	1115.71
2001	1152.65
2002	1168.53
2003	1186.1
2004	1188.87
2005	1188.21
2006	1230.15
2007	1246.55
2008	1289.07
2009	1294.08
2010	1324.65
2011	1358.82
2012	1371.19
2013	1365.85
2014	1364.87
2015	1385.42
2016	1409.94