The indicator points to a weak recovery for an economy stuck in a two-year recession.
The island owes creditors over US$70bn, compared to Detroit's US$18bn in 2013. It also has nearly US$50bn in pension liabilities.
Marsh-Rehder is hoping to swell revenues 70% over the next three years.
Moody's has said recent data showing an increase in car theft may indicate a trend that would impact a number of firms' bottom lines in 2017.
Boosted by the appreciation of the real against the euro, the Brazilian unit was the best performer in terms of premiums among all Spanish insurer Mapfre's business units.
Thousands of Puerto Ricans took to the streets on Monday to protest against austerity measures imposed by a fiscal plan.
Local experts expect a better-performing economy to be fueled by a recovery in industrial production and a higher trade surplus.