Year	% net
1988	31.0312
2003	22.91929
2004	24.63753
2005	29.40496
2007	30.24359
2008	29.76378
2009	30.11287
2010	33.73971
2011	43.27554
2013	50.34084
2014	61.45179
2015	61.7004