Year	% net
1992	15.56208
1993	16.30164
1994	19.22445
1997	23.45351
1998	25.56117
1999	28.65957
2000	30.70103
2001	32.0964
2002	33.14153
2003	36.54253
2004	38.07587
2005	38.20056
2006	37.19599
2007	38.27342
2008	38.97248
2009	40.5377
2010	42.1889
2011	42.85815
2012	45.5731
2013	48.63331
2014	53.54347
2015	56.81232
2016	59.61253
2017	60.94286
2018	60.65005