{"year":1968,"index":0.06204}
{"year":1969,"index":0.09057}
{"year":1970,"index":0.15222}
{"year":1971,"index":0.15222}
{"year":1972,"index":0.30777}
{"year":1973,"index":0.17993}
{"year":1974,"index":0.43762}
{"year":1975,"index":0.12324}
{"year":1976,"index":0.10896}
{"year":1977,"index":0.23224}
{"year":1978,"index":0.24917}
{"year":1979,"index":0.23429}
{"year":1980,"index":0.34812}
{"year":1981,"index":0.38015}
{"year":1982,"index":0.20896}
{"year":1983,"index":0.15222}
{"year":1984,"index":0.13818}
{"year":1985,"index":0.32162}
{"year":1986,"index":0.21267}
{"year":1987,"index":0.20532}
{"year":1988,"index":0.22818}
{"year":1989,"index":0.2302}
{"year":1990,"index":0.06259}
{"year":1991,"index":0.05023}
{"year":1992,"index":0.13458}