Another relevant feature of the Nigerian economy was a series of abrupt changes in the government's share of expenditures. As a percentage of gross domestic product, national government expenditures rose from 9 percent in 1962 to 44 percent in 1979 but fell to 17 percent in 1988. In the aftermath of the 1967-70 civil war, Nigeria's government became more centralized. The oil boom of the 1970s provided the tax revenue to strengthen the central government further. Expansion of the government's share of the economy did little to enhance its political and administrative capacity but did increase incomes and the number of jobs that the governing elites could distribute to their clients.