During the civil war and the ensuing Soviet–Afghan War, most of the country's infrastructure was destroyed. Normal patterns of economic activity were disrupted. The Gross national product (GNP) fell substantially during Karmal's rule because of the conflict; trade and transport was disrupted with loss of labor and capital. In 1981 the Afghan GDP stood at 154.3 billion Afghan afghanis, a drop from 159.7 billion in 1978. GNP per capita decreased from 7,370 in 1978 to 6,852 in 1981. The dominant form of economic activity was in the agricultural sector. Agriculture accounted for 63 percent of gross domestic product (GDP) in 1981; 56 percent of the labor force was working in agriculture in 1982. Industry accounted for 21 percent of GDP in 1982, and employed 10 percent of the labor force. All industrial enterprises were government-owned. The service sector, the smallest of the three, accounted for 10 percent of GDP in 1981, and employed an estimated one-third of the labour force. The balance of payments, which had grown in the pre-communist administration of Muhammad Daoud Khan, decreased, turning negative by 1982 at 70.3 million $US. The only economic activity which grew substantially during Karmal's rule was export and import.