Total revenues for Russia’s largest oil and gas exporters plunged by 41% between January and September compared to the same period last year, due to lower commodity prices and lower exports, Russia’s central bank said on Thursday. Oil and gas production and exports have dropped this year, the Bank of Russia said in a financial stability review on Thursday. Re-directing oil and gas exports requires significant investment, and changes in the nature of transactions are raising the lead times for receipt of payments. “The…