Year	% net
1998	26.03856
1999	26.48004
2000	27.27955
2001	28.1445
2002	28.9582
2003	29.94547
2004	30.85827
2005	31.40992
2006	32.80356
2007	33.7018
2008	34.68168
2009	35.79291
2010	36.99878
2011	37.36552
2012	38.07079
2013	38.72726
2014	39.38482
2015	39.94132
2016	40.96381
2017	41.25943
2018	41.64309