Year	% net
1990	47.39465
1992	56.34839
1999	65.31127
2000	68.89933
2001	71.12782
2002	70.35038
2003	70.06409
2004	69.70536
2005	69.30647
2006	68.8992
2007	68.66616
2008	68.43152
2009	69.90853
2010	72.4191
2011	74.75342
2012	75.05218
2013	75.33974
2014	76.03664
2015	77.74461
2016	81.70815
2017	84.38217
2018	86.42111