Year	% net
1977	78.47999
1986	98.17965
2001	99.72458
2002	99.92302
2003	99.61839
2004	96.84556
2005	97.19208
2006	96.53303
2007	96.14996
2008	95.40908
2009	93.07299
2010	94.73654
2011	94.87746
2012	95.23607
2013	96.37795
2014	97.26222
2015	98.91893
2016	98.90304
2017	99.09921
2018	99.10711