Year	% net
1971	6.50991
1972	7.19377
1973	9.35048
1974	10.8766
1975	12.84169
1976	14.49823
1977	15.68464
1978	15.47759
1979	15.6784
1980	17.25754
1981	18.14993
1984	21.46094
1985	24.39573
1986	25.56097
1989	29.79481
1990	33.5433
1991	42.46151
1992	42.45708
1993	46.13384
1994	45.06304
1995	46.83273
1998	65.64492
1999	60.63979
2000	62.79767
2002	61.96259
2003	63.7512