比重年份 | 货物 | 甲 | 乙 | 丙 | 丁 |
1871~1873 | 2.8 | 30.2 | 0.9 | 0.9 | |
1881~1883 | 58 | 22.8 | 03 | 1.1 | |
1891~1893 | 14.6 | 20.5 | 5.9 | 1.8 | |
1901~1903 | 18.6 | 19.7 | 4.2 | 1.7 | |
1909~1911 | 12.8 | 16.7 | 4.8 | 3.0 | |
1919~1921 | 9.6 | 18.4 | 2.4 | 5.0 |