Year	% net
1998	28.17994
1999	28.48255
2000	29.20372
2001	30.0482
2002	30.93173
2003	31.96367
2004	33.21712
2005	33.70621
2006	35.34739
2007	36.36992
2008	37.2808
2009	38.16652
2010	39.19138
2011	39.43157
2012	40.11857
2013	40.84889
2014	41.23964
2015	41.49234
2016	42.55001
2017	42.67926
2018	43.6993