British national output remained strong, and the well-organised business sector channeled products into what the military needed. Britain used its economic power to expand the Royal Navy, doubling the number of frigates, adding 50% more large ships of the line, and increasing the number of sailors from 15,000 to 133,000 in eight years after the war began in 1793. France saw its navy shrink by more than half. The smuggling of finished products into the continent undermined French efforts to weaken the British economy by cutting off markets. Subsidies to Russia and Austria kept them in the war. The British budget in 1814 reached £98 million, including £10 million for the Royal Navy, £40 million for the army, £10 million for the allies, and £38 million as interest on the national debt, which soared to £679 million, more than double the GDP. This debt was supported by hundreds of thousands of investors and taxpayers, despite the higher taxes on land and a new income tax. The cost of the war came to £831 million. In contrast, the French financial system was inadequate and Napoleon's forces had to rely in part on requisitions from conquered lands.