Year	% net
1971	11.89299
1980	17.89031
1983	14.47382
1984	14.85609
1985	12.05545
1986	13.53441
1987	15.61589
1989	16.15433
2000	31.59658
2001	33.29269
2002	35.27827
2004	38.86637
2005	40.65456
2006	41.69515
2010	44.6393