Shanghai Futures Exchange copper closed down 0.2 percent at 51,710 yuan ($8,202.47) a tonne on Monday, having hit its weakest since late September amid a decline in China's metals markets ahead of the Lunar New Year. Open interest is at the highest in nearly two years. Chinese demand for metals and supply constraints should be supportive in 2018, while recent price strength looks to be a function of global growth and demand, said Citi in a report. The Shanghai Futures Exchange will close from the evening of February 14.