Year	%
1971	92.22114
1973	100
1999	96.50351
2000	84.88399
2001	96.26083
2002	90.88401
2003	100
2004	95.34403
2005	95.6395
2007	99.86642
2008	94.29074
2011	93.00592
2012	100
2013	88.14497
2014	97.94108
2016	92.84178
2017	92.6668