Year	% net
1978	84.1292
1981	84.72761
1982	86.17759
1983	84.13915
1984	85.21789
1985	88.9003
1989	84.05027
1990	73.66866
1999	94.93646
2000	91.27349
2001	85.14533
2002	87.19142
2003	89.18286
2004	95.12096
2005	92.0335
2006	91.75268
2007	93.75514
2008	88.88199
2009	84.89659
2010	85.14956
2011	91.58659
2014	99.96777
2018	96.81848