Year	% net
1999	74.25263
2000	76.53146
2001	78.10359
2002	80.11797
2003	82.68465
2004	86.25647
2005	87.52771
2006	89.09662
2007	89.02642
2008	89.02184
2009	87.64055
2010	86.20611
2011	85.31771
2012	85.35428
2013	85.47237
2014	86.04185
2015	87.5119
2016	89.13671
2017	91.22223
2018	91.23447