1971	155.6	60
1972	169.4	79
1973	194.9	107
1974	230.0	113
1975	288.9	124
1976	346.5	134
1977	412.4	148
1978	441.6	177
1979	494.7	227
1980	554.5	272
1981	601.3	280
1982	648.6	285
1983	669.2	317
1984	706.7	342
1985	728.8	373
1986	752.6	436
1987	775.6	513
1988	802.4	646
1989	847.7	750