Year	% net
1985	21.54557
1986	22.52534
1987	22.40552
1988	22.5391
1989	22.8225
1990	23.58978
1992	24.37232
1993	23.06435
1994	23.8739
1995	24.90626
1996	24.44266
1997	23.49403
1999	22.57925
2000	23.27237
2001	25.60383
2002	27.11355
2004	30.62788
2005	32.40067
2006	35.5255
2007	39.56202
2008	46.91447
2009	47.95953
2011	60.25384
2013	61.12784
2014	62.95839
2015	63.10016
2016	59.49485
2017	62.01595
2018	62.58727
2019	66.478