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The labor force participation rate, LFPR (or economic activity rate, EAR), is the ratio between the labor force and the overall size of their cohort (national population of the same age range). Much as in other countries in the West, the labor force participation rate in the U.S. increased significantly during the later half of the 20th century, largely because of women entering the workplace in increasing numbers. Labor force participation has declined steadily since 2000, primarily because of the aging and retirement of the Baby Boom generation. Analyzing labor force participation trends in the prime working age (25-54) cohort helps separate the impact of an aging population from other demographic factors (e.g., gender, race, and education) and government policies. The Congressional Budget Office explained in 2018 that higher educational attainment is correlated with higher labor force participation for workers aged 25–54. Prime-aged men tend to be out of the labor force because of disability, while a key reason for women is caring for family members.