Year 2010 = 100 1969 18.9898384093359 1970 18.969563450456 1971 19.0054345315512 1972 19.7602868467712 1973 23.2818912429834 1974 26.5539576837511 1975 28.143202537489 1976 31.5197629970991 1977 35.9615386040134 1978 40.3159759265221 1979 53.8643272949436 1980 64.3979482391498 1981 66.5767265126257 1982 68.9894466193309 1983 75.1031265277242 1984 75.9936651062172 1985 83.5343901973094 1986 85.498642076549 1987 89.7366260342323 1988 89.8629444830418 1989 90.0840017684583 1990 93.6967094044085 1991 93.2040674540517 1992 96.3304490620855 1993 100.738962925535 1994 99.0589275563696 1995 100