Year	Percent
1971	94.99666
1972	96.87254
1973	97.0621
1998	100.91772
1999	100.87488
2002	100.2222
2004	98.7443
2011	96.77202
2012	96.62232
2013	97.43841
2014	98.45986
2015	100.181
2016	99.65672