Year	% net
1970	43.88303
1971	47.12235
1972	48.50242
1998	73.19394
1999	73.08513
2000	72.29703
2001	72.31639
2002	71.64465
2003	76.09422
2004	76.84702
2005	74.09832
2006	75.25728
2007	72.20798
2008	71.77356
2009	71.54958
2010	71.90541
2011	71.43447
2012	73.30333
2013	73.7256
2014	71.9294
2016	70.13829
2017	71.36837
2018	69.18652