| | | | | | | | | 1937 5 16 | | | | | | | | | | | | | 1945 1947 | | | | | | | | | | 1955 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1960 | | | | | | | | | | 40% 80% | | | | | | | | | | 1965 | | | | | | | | | | 1969 | | | | | | | | | | | | | | | | | | | 12 | 260 | | | | | | | | | | | | | 3.8 | | 1978 | | | | | | | | | | | | | | | | |