Year	% net
1972	20.24585
1973	20.65378
1974	21.07572
1975	22.16401
1976	23.14531
1977	23.31611
1978	24.58701
1995	44.80908
2001	49.89734
2002	51.10473
2003	53.81393
2004	55.10898
2005	53.66057
2006	57.34547
2007	64.63926
2008	64.24349
2009	65.22731
2010	66.76686
2011	72.74204
2012	73.1072
2013	76.34101
2014	75.52886
2015	75.28854
2018	77.64231