Year	% net
1991	94.78084
1992	95.44674
1993	93.76938
1994	81.44887
1995	90.40977
1996	97.36618
1997	89.18087
1998	87.86644
1999	92.18137
2000	88.01044
2001	84.72398
2002	83.80379
2003	80.81174
2004	82.61313
2005	81.43261
2006	80.27636
2007	83.05101
2008	83.56243
2009	84.35519
2010	83.84758
2011	85.40787
2012	87.94237
2013	91.6671
2017	94.68734
2018	92.24746