180 |                                              *********
 170 |                                           ***         
 160 |                                        ***            
 150 |                                ********               
 140 |                            ****                       
 130 |                      ******                           
 120 |                   ***                                 
 110 |                 **                                    
 100 |               **                                      
  90 |              *                                        
  80 |            **                                         
  70 |           *                                           
  60 |         **                                            
  50 |        *                                              
  40 |      **                                               
  30 |     *                                                 
  20 |   **                                                  
  10 | **                                                    
     |_______________________________________________________
         |    |    |    |    |    |    |    |    |    |    |
        1855 1865 1875 1885 1895 1905 1915 1925 1935 1945 1955 

1881 3.50763e-05
1882 0.00145672
1883 0.00157662
1884 0.00174457
1885 0.00696684
1886 0.107785
1887 0.130083
1888 0.0434543
1889 0.208567
1890 0.278797
1891 0.100937
1892 0.0380219
1893 0.0148729
1894 0.00602765
1895 0.00252544
1896 0.01499
1897 0.00176216
1898 0.00022312
1899 0.000105276
1900 1.49078e-05

1881 
1882 
1883 
1884 
1885 
1886 **********
1887 *************
1888 ****
1889 ********************
1890 ***************************
1891 **********
1892 ***
1893 *
1894 
1895 
1896 *
1897 
1898 
1899 
1900 

Mean 18/12/1891, i.e. 1891+0.965576