Year	% net
1976	2.05251
1977	2.07995
1980	2.15232
1982	2.51639
1983	2.3506
1984	2.42699
1985	2.633
1986	2.84889
1987	3.14835
1993	5.05246
2009	13.09097
2010	15.17589
2011	16.88675
2012	18.42151
2013	21.40103
2014	25.95054
2015	28.89895
2016	32.18514
2017	28.30495
2018	27.52277