Year	Percent
1972-01-01	122.011
1973-01-01	109.271
1974-01-01	112.075
1975-01-01	110.640
1976-01-01	102.901
1977-01-01	108.236
1978-01-01	106.551
1979-01-01	109.084
1980-01-01	106.004
1981-01-01	100.689
1999-01-01	91.448
2000-01-01	102.658