Year	Number of
1990	1732.95
1991	1722.02
1992	1693.48
1993	1661.74
1994	1605.84
1995	1537.01
1996	1501.32
1997	1456.78
1998	1415.38
1999	1370.93
2000	1336.32
2001	1312.66
2002	1274.88
2003	1246.42
2004	1221.2
2005	1194.79
2006	1191.38
2007	1173.69
2008	1144.1
2009	1125.55
2010	1082.05
2011	1057.54
2012	1042.75
2013	1015.73
2014	1005.36
2015	1004.64
2016	1008.57