Year	% net
1992	15.76074
1993	15.57123
1994	15.47601
1995	15.93693
1996	16.14427
1997	16.12005
1998	16.82243
1999	17.01113
2000	17.84554
2001	18.44718
2002	19.29506
2003	20.92194
2004	21.90672
2005	23.02294
2006	24.18954
2007	25.16454
2008	26.71067
2009	27.67069
2010	29.03108
2011	30.28114
2012	31.25175
2013	30.32438
2014	30.67395
2015	31.42483
2016	30.64733
2017	30.87281
2018	30.97367