The black market became a major feature of Burmese society, representing about 80% of the national economy during the Burmese Way period. Moreover, income disparity became a major socioeconomic issue. Throughout the 1960s, Burma's foreign exchange reserves declined from $214 million in 1964 to $50 million in 1971, while inflation skyrocketed. Rice exports also declined, from 1,840,000 tons in 1961-62 to 350,000 tons in 1967-68, the result of the inability of rice production to satisfy demand caused by high population growth rates.