| 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 | 
                                            
                                                
                                             |