Against this grim backdrop, in 1982, Prime Minister Martens' center-right coalition government formulated an economic recovery program to promote export-led growth by enhancing the competitiveness of Belgium's export industries through an 8.5% devaluation. Economic growth rose from 2% in 1984 to a peak of 4% in 1989. In May 1990, the government linked the Belgian franc to the Deutsche Mark, primarily through closely tracking German interest rates. Consequently, as German interest rates rose after 1990, Belgian rates have increased and contributed to a decline in the economic growth rate. In 1992–93, the Belgian economy suffered the worst recession since World War II, with the real GDP declining 1.7% in 1993.