Year	% net
1975	24.17626
1977	24.70997
1988	33.31495
1996	37.29169
1997	42.63793
1998	47.74362
1999	49.66303
2000	51.30694
2001	52.50412
2002	55.89137
2003	57.40992
2011	61.66744
2013	78.09266
2015	79.09656
2016	73.15289