In Singapore, services are the biggest sector of the economy and account for 72 percent of GDP. Within services the most important segments are: wholesale and retail trade (18 percent of total GDP); business services (16 percent); finance and insurance (13 percent), transport and storage (10 percent) and information and communications (5 percent). Industry contributes the remaining 28 percent total output. Manufacturing (21 percent) and construction (5 percent) are the most important industry segments.