(Bloomberg) -- Kuwait was downgraded by Fitch Ratings, which cited ongoing political constraints on decision-making in the oil-rich nation.

The credit rating was cut one level to AA-, the fourth-highest investment-grade level at Fitch, according to a statement on Thursday. Constraints on decision-making has hindered “addressing structural challenges related to heavy oil dependence, a generous welfare state and a large public sector,” Fitch said.

Years of political tensions have stymied efforts to diversify the economy of Kuwait, home to about 8.5% of the world’s oil reserves, and promote foreign investment. The government has been unable to borrow since its debut Eurobond in 2017, forcing it to rely on its General Reserve Fund instead.

“There has been a lack of meaningful underlying fiscal adjustment to recent oil-price shocks and the outlook for reforms remains weak, despite some positive political developments as part of a national dialogue,” Fitch said.

Read: Kuwait Sees $10 Billion Deficit on Higher Oil, Cuts Spending

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