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cpi-u in 1950 was 24.1 cpi-u in 1960 was 29.6 cpi-u in 1970 was 38.8 cpi-u in 1980 was 82.4 cpi-u in 1990 was 130.7 cpi-u in 2000 was 172.2 what is the percentage change in the price level from 1960 to 1970?