Year	% net
1970	30.37048
1971	32.26457
1972	34.55265
1998	79.31866
1999	78.40348
2000	78.43881
2001	78.30474
2002	77.85817
2003	84.73717
2004	85.11847
2005	79.89456
2006	81.8068
2007	76.86121
2008	76.54197
2009	76.588
2010	76.90315
2011	77.05669
2012	78.35515
2013	78.93621
2014	77.54029
2016	76.86952
2017	77.62036
2018	75.42821