| year | 
                        cash dividends | 
                        stock dividends | 
                         
                        
                        | ex-dividend date | 
                        per share(nt $) | 
                        ex-date | 
                        per share(nt $) | 
                         
                        
                        
                        | 2019 | 
                        2020/06/23 | 
                        4.6 | 
                        2020/06/23 | 
                        0.4 | 
                         
                        
                        | 2018 | 
                        2019/07/31 | 
                        4.2 | 
                        2019/07/31 | 
                        0.3 | 
                         
                        
                        | 2017 | 
                        2018/07/31 | 
                        3.8 | 
                        2018/07/31 | 
                        0.2 | 
                         
                        
                        | 2016 | 
                        2017/07/27 | 
                        3.4 | 
                         | 
                         | 
                         
                        
                        | 2015 | 
                        2016/08/02 | 
                        3.1 | 
                         | 
                         | 
                         
                        
                        | 2014 | 
                        2015/07/28 | 
                        2.8 | 
                        2015/07/28 | 
                        0.4 | 
                         
                        
                        | 2013 | 
                        2014/07/28 | 
                        2 | 
                        2014/07/28 | 
                        1 | 
                         
                        
                        | 2012 | 
                        2013/06/26 | 
                        2 | 
                        2013/08/27 | 
                        1 | 
                         
                         
                     		
                 |