In the United States in 1979, women 25 years and older earned an average of 67.5% of a man's salary. In 2009, women in that age group earned an average of 88.7% of a man's salary. Looking at smaller age groups, however, we see a greater disparity. Women 20-24 years old earn 93% of a man's salary, while women 45-54 years old earn 73.6%. Based on the information on the left, what can be inferred about women’s earning power in the developed world? It is decreasing for women under 25. It is increasing for women under 25. It is increasing for women over 45. It remains unchanged.