Table 1.
Latitude/place | 1940 | 1945 | 1950 | 1955 | 1960 | 1965 | 1970 | 1975 | 1980 | 1985 | 1990 | 1995 | 2000 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
30°S Australia | 16.33 | 17.89 | 21.43 | 25.90 | 32.20 | 32.13 | |||||||
40°S New Zealand | 6.10 | 7.65 | 9.55 | 15.55 | 18.50 | 20.80 | 27.40 | 31.70 | 33.10 | ||||
40°N USA | 1.00 | 1.48 | 2.24 | 2.67 | 3.73 | 4.56 | 7.23 | 9.95 | 10.85 | 12.75 | 14.67 | 17.74 | |
49°N Middle Europe | 1.50 | 1.48 | 1.55 | 2.01 | 2.02 | 2.47 | 2.86 | 3.12 | 3.78 | ||||
52°N Canada | 2.00 | 2.12 | 2.64 | 3.18 | 4.73 | 5.97 | 7.08 | 7.95 | 9.74 | ||||
60°N Northern Europe | 1.80 | 2.24 | 3.28 | 4.18 | 5.09 | 5.99 | 7.68 | 9.20 | 10.29 | 11.33 |