In the United States, the female-to-male earnings ratio was 0.77 in 2009; female full-time, year-round (FTYR) workers earned 77% as much as male FTYR workers. Womens earnings relative to mens fell from 1960 to 1980 (56.7-54.2%), rose rapidly from 1980 to 1990 (54.2-67.6%), leveled off from 1990 to 2000 (67.6-71.2%) and rose from 2000 to 2009 (71.2-77.0%). When the first Equal Pay Act of 1963 was passed in 1963, female full-time workers earned 48.9% as much as male full-time workers.

Question: How many years was the time span where women's earnings relative to men's fell?
Answer: 20

Question: How many percentage points did women's earning rise from 1980 to 1990?
Answer: 13.4

Question: How many percentage points did women's earnings increase during the period of 2000 to 2009?
Answer: 5.8

Question: How many percentage points difference is there between the highest amount of female-to-male earnings and the lowest?
Answer: 22.8

Question: How many percentage points difference is there between the highest and lowest female-to-male earnings ratio between 1960 and 1980?
Answer: 2.5

Question: How many percentage points difference is there between the highest and lowest female-to-male earnings ratio between 1980 and 1990?
Answer: 13.4

Question: How many percentage points difference is there between the highest and lowest female-to-male earnings ratio between 1990 and 2000?
Answer: 3.6

Question: How many percentage points less did women earn than men in 1963 vs 2009?
Answer: 28.1

Question: How many percentage points did the female to male earnings ratio improve in 2009 compared to 1963?
Answer: 28.1

Question: What were all the period of years that Women earnings rose?
Answer: 1980 to 1990

Question: How many years from 2000-2009 did the percentage rose 71.2-77.0%?
Answer: 9

Question: How many percentage did the Women earnings rise 1980-1990?
Answer: 13.4