Year	% net
1977	97.36256
1978	90.53762
1981	93.9429
1985	91.42218
1998	99.69632
1999	98.91738
2000	97.93079
2001	96.20012
2002	93.55176
2005	90.70151
2006	91.78953
2008	97.42175
2009	98.5813
2010	98.01475
2011	99.32474
2012	98.05641
2013	97.96511