Government expenditure on research and development is relatively low (0.3% of GDP in 2019) and Indonesia only ranked 87th (out of 132 economies) on the 2021 Global Innovation Index report. Historical examples of scientific and technological developments include the paddy cultivation technique ''terasering'', which is common in Southeast Asia, and the pinisi boats by the Bugis and Makassar people. In the 1980s, Indonesian engineer Tjokorda Raka Sukawati invented a road construction technique named Sosrobahu that allows the construction of long stretches of flyovers above existing main roads with minimum traffic disruption. It later became widely used in several countries. The country is also an active producer of passenger trains and freight wagons with its state-owned company, the Indonesian Railway Industry (INKA), and has exported trains abroad.