| The result of internal evaluation in 2024 | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | The result of internal evaluation in 2023 | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | The result of internal evaluation in 2022 | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | The result of internal evaluation in 2021 | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | The result of internal evaluation in 2020 | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | The result of internal evaluation in 2019 | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | The result of internal evaluation in 2018 | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | Rules of Procedure for Board of Directors Meeting | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | Procedures for Election of Directors | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | The diversity of the board members and the biographies of director | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | Major resolution content of Board of Directors meeting | 
                                        
                                            
                                         | 
                                    
                                                                    
                                        | Rules for Performance Evaluation of Board of Directors | 
                                        
                                            
                                         |