国家 | 1890 | 1900 | 1910 | 1920 | 19 33 |
英国 | 11.2 (29.9%) | 13.5 (32.8%) | 15.3 (34.9%) | 16.6 (37.3%) | 18.7 (39.2%) |
美国 | 9.6 (15.3%) | 14.2 (18.7%) | 20.3 (22.0%) | 27.4 (25.9) | 45.1 (32.8%) |
德国 | 5.6 (11.3%) | 8.7 (15.5%) | 12.9 (20.O%) | 15.3 (35.7%) | 20.7 (30.2%) |
俄国 | 4.3 (3.6%) | 6.6 (4.8%) | 10.2 (6.4%) | 4.0 (3.1%) | 36.5 (20.2%) |