exchange rate dollar to naira gtb,  The " Chinese Pearl Industry Analysis Report 2018 -Market In-depth Analysis and Development Prospect Study" released by Guanyan World shows that from 2013 to 2017 , the Chinese pearl industry has been in a state of oversupply , with an output of 1791.0 tons in 2013 and a demand of 1558.2 tons. ; By 2017 , the output reached 2868.3 tons, the demand was 2466.7 tons, the supply exceeded the demand by more than 400 tons, and the supply-demand relationship was further unbalanced.