Year	% net
1989	85.03463
1990	85.29872
1991	85.77267
1992	86.97444
1993	90.74521
1994	93.94418
1995	95.90112
1996	97.91437
1997	98.30114
1999	97.88035
2000	97.32263
2001	95.82907
2002	97.79684
2003	98.59507
2004	100
2005	100
2006	99.72326
2007	98.44464
2008	97.17291
2009	95.08476
2010	93.08986
2011	91.6258
2012	92.5291
2013	94.28945
2014	96.51499
2015	99.46348