Year	Percent
1971	94.30964
1972	96.09868
1973	96.22576
1998	101.08405
1999	100.6204
2002	100.57691
2004	99.16997
2011	97.31097
2012	96.1154
2013	97.9411
2014	98.12804
2015	100.57227
2016	99.71158