4,150 km gravel, 4,096 km earth (1990)

1.536018 0.651034 2.9715% 1984 5.551425 0.180134 3.6576% 1983 3.073941 0.325315 3.8998% 1982 0.476647 2.097990 6.3831% 1981 1.489701 0.671275 9.6843% 1980 7.024591 0.142357 9.0330% 1979 5.240065 0.190837 8.8650% 1978 0.694899 1.439058 7.2813% 1977 7.735785 0.129269 6.6558% 1976 9.014526 0.110932 6.4073% 1975 4.669352 0.214162 9.8159% 1974 8.060069 0.124068 9.0909% 1973 3.235273 0.309093 6.4509% 1972 6.370053 0.156985 4.7304% 1971 5.223540 0.191441 5.7132% 1970 0.284937 3.509549 5.5272% 1969 0.182411 5.482121 5.5714% 1968 2.386116 0.419091 5.0148% 1967 0.177960 5.619253 2.5719% 1966 4.268274 0.234287 3.5485% 1965 1.161528 0.860935 2.7360% 1964 2.208117 0.452875 1.5423% 1963 4.319821 0.231491 1.5697% 1962 4.037960 0.247650 2.2421% 1961 4.216172 0.237182 0.9709% 1960 0.165675 6.035924 1.6442% 1959 0.974364 1.026311 2.3579% 1958 0.165610 6.038301 2.0623% 1957 4.343470 0.230231 3.5571% 1956 3.797279 0.263346 3.3098% 1955 0.177432 5.635967 3.4226% 1954 0.253127 3.950591 1.5421% 1953 0.138868 7.201066 1.5703%

skeptical