Year	% net
1992	18.73367
1993	18.79229
1994	19.15096
1995	19.43387
1996	19.31424
1997	19.17974
1998	19.53342
1999	19.78153
2000	20.59846
2001	21.48701
2002	22.44371
2003	23.56417
2004	25.19252
2005	26.03461
2006	27.07259
2007	27.71894
2008	29.95174
2009	31.69686
2010	33.33969
2011	33.43053
2012	33.58423
2013	34.60919
2014	35.15924
2015	35.79906
2016	36.64592
2017	37.50818
2018	37.77716