Year	Number of
1990	1072.21
1991	1037.7
1992	1032.99
1993	1047.76
1994	1070.98
1995	1095.95
1996	1102.85
1997	1124.17
1998	1147.8
1999	1157.86
2000	1157.45
2001	1163.63
2002	1181.65
2003	1197.3
2004	1208.81
2005	1215.89
2006	1193.66
2007	1186.84
2008	1188.03
2009	1221.48
2010	1255.81
2011	1273.21
2012	1300.5
2013	1296.32
2014	1290.5
2015	1309.83
2016	1336.51