Year	% net
1987	9.14158
1994	24.65736
2002	59.32541
2003	60.96055
2004	60.67487
2005	64.48282
2006	65.12895
2007	67.19726
2009	70.2714
2012	73.94385
2013	75.29022
2014	75.75436
2015	75.85656
2016	75.69258
2017	75.42516
2018	74.47218