10 month According to Snowball.com, from 5,438+00 in June 2003 to 3,000 in March 2004, Luntong began to increase from 1800, an increase of 67%. In the same period, Yunnan copper rose from 3.05 to 4.46, an increase of 46%. In September 2003, copper in the southern part of US stocks began to rise predictably, ahead of futures, rising from 0.2% to 0.5%.