Year	% net
1970	71.56228
1981	86.28305
1993	89.88694
1995	84.76956
1998	94.98761
1999	96.3395
2000	97.12096
2003	98.52722
2009	96.29702
2011	96.86038
2012	91.82595
2013	93.9215
2014	92.92047
2015	93.05232