Year	% net
1971	6.88741
1972	7.63231
1973	8.96617
1974	9.98217
1975	11.44689
1976	12.7657
1977	13.74645
1978	13.58212
1979	13.5333
1980	15.32198
1981	16.58011
1984	19.96255
1985	22.74431
1986	24.168
1989	28.63336
1990	31.77361
1991	39.68134
1992	40.16109
1993	43.78824
1994	43.10613
1995	43.08806
1998	62.07418
1999	56.64096
2000	59.25608
2002	58.0914
2003	59.78544