COE prices are determined by the interaction of demand and supply. Demand is affected by factors such as the economy or new vehicle launches. When the economy is doing well, or when new car models are launched, demand for cars will increase. This could lead to higher COE prices.　

引用链接：https://www.gov.sg/factually/content/what-influences-coe-prices　

另贴新加坡07年以来GDP growth rate:　

　楼主屁爱吃帝，英文应该没啥问题