One of the best-known measures to deal with the economic problems of that time was implemented under General Prem Tinsulanonda's government, in power from 1980 to 1988. Between 1981 and 1984 the government devalued the national currency, the Thai baht (THB), three times. On 12 May 1981, it was devalued by 1.07 percent, from THB20.775/US$ to THB21/US$. On 15 July 1981 it was again devalued, this time by 8.7 percent (from THB21/US$ to THB23/US$). The third devaluation, on 5 November 1984, was the most significant: 15 percent, from THB23/US$ to THB27/US$. The government also replaced the country's fixed exchange rate (where it was pegged to the US dollar) with a "multiple currency basket peg system" in which the US dollar bore 80 percent of the weight. Calculated from the IMF's World Economic Outlook Database, in the period 1980–1984 the Thai economy had an average GDP growth rate of 5.4 percent.