Year	% net
1973	22.46957
1974	23.04631
1976	29.70386
1977	31.62607
1978	32.31564
1993	69.27544
1994	76.77567
1995	75.2558
1999	80.64397
2000	81.65938
2001	79.30832
2002	79.09426
2003	80.35618
2005	82.05246
2006	82.64076
2013	92.51532
2014	92.78381
2015	93.58598
2016	93.94509
2017	94.66479