1964	59.5		283.3	
1968	60	130.5	271.8	564
1972	58.6	123.6	259	533.7
1976	55.6	119.3	249.9	517.1
1980	54.8	118.3	248.8	508.9
1984	55.9	119.2	247.1	505
1988		117.6	243.8	500.2