{"year":1969,"Y":50,"f":623}
{"year":1970,"Y":49,"f":628}
{"year":1971,"Y":47.5,"f":520}
{"year":1972,"Y":45,"f":513}
{"year":1973,"Y":51,"f":661}
{"year":1974,"Y":56,"f":919}
{"year":1975,"Y":66,"f":1158}
{"year":1976,"Y":58,"f":1970}
{"year":1977,"Y":52,"f":1317}