Year	% net
1976	16.52433
1977	14.53011
1981	16.01118
1983	19.38873
1987	19.49982
1998	41.96004
1999	45.10087
2000	46.4506
2001	47.72372
2002	48.85865
2003	48.62257
2004	45.27481
2005	43.94428
2006	44.60284
2007	45.41006
2009	46.3405
2010	47.65124
2011	47.29212
2012	49.66535
2013	54.27441
2015	59.13634
2016	65.21977
2017	63.74088
2018	66.54968