Year	Number of
1990	1116.85
1991	1133.18
1992	1153.63
1993	1182.16
1994	1179.71
1995	1181.96
1996	1181.56
1997	1194.05
1998	1217.04
1999	1248.5
2000	1253.47
2001	1270.78
2002	1287.67
2003	1272.06
2004	1253.77
2005	1257.9
2006	1269.82
2007	1292.35
2008	1301.64
2009	1308.73
2010	1316.35
2011	1313.57
2012	1296.05
2013	1273.19
2014	1243.41
2015	1243.25
2016	1254.67