6 with permanent-surface runways: 21 with runways 1,220-2,439

0.0000% 1909 0.073035 13.692003 3.8464% 1908 1.000000 1.000000 8.9328% 1933 1.534237 0.651790 -2.6088% 1932 1.000000 1.000000 2.2421% 1961 0.783913 1.275652 0.9709% 1960 0.459142 2.177977 1.6442% 1959 3.200149 0.312485 2.3579% 1958 0.111880 8.938158 2.0623% 1957 1.123527 0.890055 3.5571% 1956 0.909390 1.099638 3.3098% 1955 3.626472 0.275750 3.4226% 1954 3.925544 0.254742 1.5421% 1953 1.171964 0.853268 1.5703% 1952 2.276860 0.439201 1.5948% 1951 0.862538 1.159369 5.0183% 1950 1.625881 0.615051 1.7034% 1949 1.766927 0.565954 -0.4250% 1948 1.829534 0.546587 6.7886% 1947 0.105339 9.493173 13.9149% 1946 2.424985 0.412374 22.7896% 1945 1.999984 0.500004 3.2661% 1944 1.040826 0.960775 1.3234% 1943 0.466050 2.145691 2.7232% 1942 0.136489 7.326590 0.0000% 1926 2.013740 0.496589 -2.0001% 1925 1.973722 0.506657 0.6731% 1924 0.973828 1.026875 2.0549% 1923 0.155315 6.438526 2.8137% 1921 0.085642 11.676519 -7.1894% 1920 2.067545 0.483665 -13.0688% 1919 2.478864 0.403411 15.7925% 1918 1.070400 0.934230 14.2845% 1917 0.404252 2.473706 16.6637% 1916 0.780858 1.280643 20.0069% 1915 1.319322 0.757965 9.1939% 1914 0.915802 1.091939 2.3510% 1913 0.157407 6.352950 YEAR: 1973 2010 5.800517 0.172398 4% Est. 2008 20.579119 0.048593 4% Est. 1994 11.108754 0.090019 4% Est. 1998 6.818947 0.146650 4%

gravelling