Year	% net
1971	7.28122
1972	8.08881
1973	8.57063
1974	9.06335
1975	10.01349
1976	10.95831
1977	11.69472
1978	11.5521
1979	11.22264
1980	13.24044
1981	14.88072
1984	18.40293
1985	21.04364
1986	22.72199
1989	27.40647
1990	29.90168
1991	36.75411
1992	37.75794
1993	41.35102
1994	41.08938
1995	39.30051
1998	58.4845
1999	52.63121
2000	55.71044
2002	54.22795
2003	55.83538