Year	% net
1998	21.23195
1999	21.57845
2000	22.41829
2001	23.35455
2002	24.52033
2003	25.51508
2004	26.82411
2005	27.83074
2006	28.78221
2007	29.8421
2008	31.40325
2009	32.6019
2010	33.92753
2011	34.14694
2012	34.42672
2013	35.2822
2014	35.90736
2015	36.66352
2016	36.82146
2017	36.90465
2018	37.16256