Year	% net
1984	74.43465
1985	75.84309
1986	77.71379
1987	78.3658
1988	80.23005
1989	81.50243
1990	86.91748
1992	91.58669
1997	89.40619
1999	83.59534
2000	84.52041
2002	94.65108
2003	93.88835
2004	95.66397
2005	93.66697
2006	94.24863
2007	94.74009
2009	97.27738
2010	96.26721
2011	96.3948
2012	97.51399