GDP growth fluctuated widely, however, with major swings in the current account balance (Figure 8.1). Agricultural production fluctuations, due to variability in rainfall and terms of trade changes, account for a major part of GDP growth fluctuations, with their effect declining with increased diversification of the economy. Different patterns in growth and the current account are discernable over the periods 1972-80, 1981-6, 1987-9 and 1990-7 (Table 8.1). After a surge in the 1970s, growth declined and the current account deficit increased. A major episode was the balance-of-payments crisis in 1985-6 which followed a period of large current account deficit (8.4 per cent of GDP during 1981-6), a significant decline in terms of trade because of the sharp decline in oil prices and poor productivity growth.