2050                    

     7   19      

           21    

              

               

          19     

 2050              

 4.87       34.9%    

               

              

               

2025        60        

     3            

 2033   4           

    2050      4.87    

                

            

   1999           

               

2017         60        

 2.41       17.3%    1999  

2017          1.1  