1939 . " " 1973 . 1977 . . 1979 21 1990 . . . 1990 . . 26 1990 . 2 71 . 22 1973... 3 1977 1 1979 . 40 . 20 . 250 . 600 . . .. : ... 45 ... 12 ... ɻ ... ... 40 200 20 ...