Year	% net
1992	14.44277
1993	14.45191
1994	14.48769
1995	14.68136
1996	14.63327
1997	14.58592
1998	14.93036
1999	15.18335
2000	15.80981
2001	16.65368
2002	17.42858
2003	18.32195
2004	19.42887
2005	20.13448
2006	20.68107
2007	21.12581
2008	23.28003
2009	24.93558
2010	26.74966
2011	27.02615
2012	27.39594
2013	28.61577
2014	29.23948
2015	30.08896
2016	30.80293
2017	31.79068
2018	32.19886