Year	% net
1971	48.75784
1972	49.38628
1973	49.11181
1992	46.43101
1994	67.47845
1996	96.75963
1997	92.9054
1999	83.99987
2000	82.30239
2001	81.66662
2006	93.75522
2007	91.94043
2008	90.93286
2009	87.59613
2010	89.48552
2011	87.4917
2012	88.37848
2013	87.03458
2014	86.31032
2015	88.71225