Year	% net
1973	13.8499
1978	13.71061
1980	15.04514
1981	16.53072
1982	18.5612
1983	23.7192
1984	28.0895
1985	32.32319
1986	35.33768
1987	40.80462
1988	44.49855
1993	45.17336
2000	37.49217
2001	45.31442
2002	44.27864
2003	48.07812
2004	51.278
2005	54.81854
2006	73.01119
2007	80.84774
2008	91.84636
2009	91.15986
2010	96.42535
2017	96.35943
2018	94.09198