{"Year":1950,"Ratio":99.6}
{"Year":1955,"Ratio":99.8}
{"Year":1960,"Ratio":100}
{"Year":1965,"Ratio":100.2}
{"Year":1970,"Ratio":100.4}
{"Year":1975,"Ratio":100.7}
{"Year":1980,"Ratio":100.8}
{"Year":1985,"Ratio":101}
{"Year":1990,"Ratio":101.2}