Year	% net
1998	29.5835
1999	29.29999
2000	29.5595
2001	30.48757
2002	30.97379
2003	31.72914
2004	33.52494
2005	33.93582
2006	35.89015
2007	36.66764
2008	37.95605
2009	38.96587
2010	40.42474
2011	40.32432
2012	40.34677
2013	41.75226
2014	42.30329
2015	41.7424
2016	43.48944
2017	44.27608
2018	44.93787