U.S. retirees are collecting more in retirement income today from employer-sponsored plans than in the mid-1970s, according to a report by the Investment Company Institute. The research found that in 2011, 33 percent of retirees received retirement income from private-sector retirement plans, compared with 21 percent in 1975. The median income from those retirement plans in 2011 was $6,300, compared with $4,700 in 1975 (in 2011 dollars).