Across all income groups, retirement income from employer-sponsored retirement plans is more prevalent among retirees today than in 1975, when sweeping new retirement plan regulations were enacted, most notably the Employee Retirement Income Security Act, according to a report from the Investment Company Institute.

In 2009, 34% of retirees received income, either directly or through a spouse, from private sector retirement plans, up from 21% in 1975. The median income was $6,000 in 2009, up from $4,500 in 1975 (in 2009 dollars).

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