Year	% net
1993	93.80688
1994	93.46468
1995	92.19694
1996	92.45069
1997	92.16192
1998	92.29827
1999	92.49885
2000	91.8084
2001	92.40911
2002	93.14406
2003	94.76158
2004	94.14444
2005	92.77085
2006	92.80817
2007	92.92426
2008	93.06533
2009	92.74845
2010	93.36737
2011	93.53405
2012	93.43554
2013	93.83136
2014	93.6168
2015	93.84996
2016	93.97116
2017	92.30525
2018	92.15259