Year	% net
1992	13.9121
1993	14.41288
1994	17.09353
1997	20.72817
1998	22.95058
1999	25.6322
2000	27.41947
2001	28.96552
2002	29.97322
2003	33.31071
2004	34.94459
2005	35.19979
2006	34.41882
2007	35.52986
2008	36.52896
2009	38.11272
2010	39.96589
2011	40.66093
2012	43.58459
2013	47.07239
2014	52.32234
2015	55.82319
2016	58.73341
2017	60.13026
2018	60.0122