1868 - 500
1871 - 1000
1876 - 4000
1879 - 6000
1882 - 8000
1884 - 10000
1887 - 12000
1889 - 14000
1892 - 16000
1895 - 18000
1897 - 20000
1899 - 22000
1901 - 24000
1902 - 25000
1903 - 26000
1905 - 28000
1908 - 30000
1911 - 32000
1916 - 34000
1921 - 36000
1930 - 37500