Year	% net
1992	18.4348
1993	18.28536
1994	18.39475
1995	18.93001
1996	19.09765
1997	19.03224
1998	19.7507
1999	19.92933
2000	20.88775
2001	21.57816
2002	22.60587
2003	24.22189
2004	25.37447
2005	26.52101
2006	27.89233
2007	28.81502
2008	30.42957
2009	31.25516
2010	32.39683
2011	33.424
2012	34.18809
2013	33.00196
2014	33.30497
2015	33.99723
2016	33.3952
2017	33.51031
2018	33.57867