Year	% net
1978	76.96623
1981	84.49641
1982	79.69562
1983	81.70127
1984	82.70229
1985	86.70942
1989	79.64266
1990	83.96147
1999	94.86361
2000	92.50754
2001	87.85239
2002	88.09406
2003	89.80873
2004	91.01844
2005	92.35566
2006	91.74654
2007	90.49503
2008	87.56635
2009	83.9071
2010	85.22387
2011	86.16039
2014	98.62536
2018	90.61275