Year	% net
1975	98.52012
1976	92.87918
1977	92.51731
1979	86.81742
1980	85.95189
1981	84.34806
1982	87.72838
2000	94.78214
2001	89.7846
2002	94.44293
2003	88.03911
2004	84.56946
2005	83.42215
2006	81.8969
2007	83.08997
2008	83.93383
2009	87.39084
2011	95.64645
2016	95.42178