Year	Percent
1971	95.71384
1972	97.68053
1973	97.9356
1998	100.74256
1999	101.14291
2002	99.84864
2004	98.29583
2011	96.20503
2012	97.15492
2013	96.91118
2014	98.80767
2015	99.77036
2016	99.59905