Tractors in India are a major industry and significant contributor to its agriculture output gains. In 1947, as India gained independence from the British Empire, the level of agriculture mechanisation was low. The socialist oriented five-year plans of the 1950s and 1960s aggressively promoted rural mechanisation via joint ventures and tie-ups between local industrialists and international tractor manufacturers. Despite these efforts, the first three decades after independence local production of 4-wheel tractors grew slowly. By the late 1980s tractor production was nearly 140,000 units per year, and a prevalence rate of less than 2 per 1,000 farmers.