Nonprofits boosting Boston’s coffers

Boston nonprofits have boosted their voluntary contributions to city government over the past six months by 24 percent, advancing a longstanding goal of Mayor Thomas M. Menino, despite the misgivings of some institutions.

Since July, the city has received $9.4 million from tax-exempt institutions such as colleges, hospitals, and museums, a substantial increase over last year’s pace, according to the mayor’s office.