This report is the fourth report of Formosa Petrochemical Corporation. (hereinafter referred to as "FPCC"). The information disclosure period is from January 1, 2017 to December 31, 2017. The scope is mainly within Taiwan’s boundary. If there is any relevant information beyond this scope, it will be indicated in the report, and the information will be disclosed by presenting the 3-year data as the editorial principle. Past reports can be downloaded from our CSR website.