Year	% net
1992	12.6759
1993	12.62898
1994	12.72591
1995	13.05248
1996	13.09863
1997	13.17969
1998	13.79844
1999	14.30948
2000	14.91729
2001	15.44028
2002	16.05972
2003	16.72659
2004	17.65551
2005	18.79549
2006	20.07638
2007	21.53237
2008	23.10107
2009	24.37313
2010	25.7815
2011	26.81441
2012	27.77527
2013	28.21904
2014	28.95092
2015	29.97528
2016	29.71216
2017	30.11568
2018	30.48065