Year	% net
1992	27.82551
1994	31.44747
1995	32.80085
1996	35.03013
1997	35.57592
1999	42.14775
2000	49.21579
2001	51.99748
2002	59.19617
2003	66.81974
2004	71.79933
2005	76.35411
2006	78.21516
2007	72.73174
2008	67.87844
2009	63.22522
2010	58.72927
2011	61.20952
2012	62.87834
2013	60.83393
2014	59.86195
2015	56.84125
2017	49.31431
2018	48.97839