1954 7.249073 7.245084 7.257003 7.271565
1955 7.292746 7.303641 7.316880 7.325610
1956 7.323633 7.328175 7.328897 7.339927
1957 7.348137 7.347557 7.353402 7.337783
1958 7.317279 7.322643 7.346010 7.369412
1959 7.381751 7.400621 7.396028 7.404523
1960 7.421537 7.418661 7.419620 7.411012
1961 7.421357 7.433726 7.447926 7.470167
1962 7.483188 7.493540 7.502793 7.501137
1963 7.514582 7.528332 7.545654 7.552815
1964 7.574918 7.583451 7.593475 7.597747
1965 7.619184 7.633563 7.649359 7.672106
1966 7.691702 7.694302 7.704496 7.709398
1967 7.715034 7.720994 7.735302 7.740925
1968 7.752464 7.769336 7.777080 7.776115
1969 7.790075 7.791440 7.796963 7.792968
1970 7.786801 7.785929 7.798031 7.788958
1971 7.815449 7.815368 7.820480 7.820440
1972 7.842122 7.861380 7.871731 7.890321
1973 7.913521 7.916078 7.915093 7.924000
1974 7.918410 7.921245 7.908130 7.899302
1975 7.879556 7.889684 7.906510 7.920338
1976 7.938945 7.943392 7.947537 7.957457
1977 7.971086 7.987083 8.006967 8.004399
1978 8.013178 8.044273 8.052806 8.065139
1979 8.065171 8.064291 8.073216 8.071312
1980 8.081289 8.057377 8.058042 8.070656
1981 8.089820 8.086472 8.090893 8.076919
1982 8.061613 8.064605 8.056585 8.058106
1983 8.066710 8.088961 8.103615 8.121213
1984 8.146622 8.159947 8.166387 8.170525
1985 8.182420 8.188467 8.198584 8.205874
1986 8.221291 8.219218 8.221828 8.225423
1987 8.236606 8.248791 8.259795 8.274612