YEAR O-18 PDB 1981 -4.13 1980 -4.26 1979 -4.44 1978 -4.15 1977 -4.26 1976 -4.48 1975 -4.17 1974 1973 1972 -4.65 1971 -4.37 1970 -4.35 1969 -4.54 1968 -4.35 1967 -4.14 1966 -4.23 1965 -4.54 1964 -4.31 1963 -4.38 1962 -4.44 1961 1960 1959 1958 1957 1956 1955 1954 1953 1953 -4.18 1952 -3.94 1951 -3.92 1950 -3.50 1949 -3.84 1948 -4.03 1947 -3.67 1946 -3.79 1945 -3.69 1944 -3.68 1943 -3.88 1942 -4.09 1941 -4.29 1940 -4.20 1939 -4.04 1938 -3.81 1937 -3.93 1936 -3.96 1935 -3.83 1934 -4.05 1933 -3.86 1932 -4.09 1931 -4.01 1930 -4.12 1929 -3.90 1928 -3.71 1927 -3.88 1926 -3.81 1925 -4.02 1924 -4.00 1923 -4.04 1922 -4.17 1921 -3.99 1920 -3.89 1919 -4.02 1918 -4.16 1917 -3.65 1916 -4.00 1915 -3.89 1914 -3.81 1913 -3.90 1912 -3.95 1911 -4.08 1910 -3.82 1906 -4.13 1905 -4.34 1904 -3.94 1903 -4.21 1902 -4.32 1901 -4.14 1900 -3.75 1899 -3.71 1898 -3.96 1897 -3.85 1896 -4.15 1895 -4.00 1894 -4.07 1893 -4.06 1892 -3.90 1891 -4.05 1890 -3.69 1889 -4.08 1888 -4.54 1887 -4.29 1886 -4.19 1885 -4.08 1884 -4.25 1883 -3.79 1882 -3.84 1881 -4.02 1880 -3.97 1879 -3.72 1878 -3.99 1877 -4.05 1876 -4.15 1875 -4.04 1874 -4.12 1873 -4.30 1872 -4.00 1871 -4.30 1870 -4.32 1869 -4.15 1868 -4.13 1867 -4.00 1866 -4.26 1865 -4.41 1864 -4.34 1863 -4.17 1862 -4.02 1861 -4.06 1860 -4.10 1859 -3.91 1858 -3.90 1857 -3.85 1856 -4.01 1855 -3.96 1854 -4.11 1853 -4.26 1852 -4.00 1851 -4.09 1850 -3.97 1849 -3.77 1848 -3.67 1847 -4.15 1846 -3.98 1845 -3.94 1844 -3.70 1843 -4.03 1842 -4.12 1841 -4.04 1840 -4.45 1839 -4.05 1838 -4.23 1837 -4.25 1836 -3.95 1835 -3.81 1834 -3.67 1833 -3.91 1832 -4.00 1831 -4.33 1830 -4.25 1829 -3.94 1828 -4.17 1827 -4.26 1826 -3.99 1825 -4.13 1824 -4.00 1823 -4.28 1822 -3.86 1821 -3.84 1820 -4.04 1819 -4.00 1818 -3.95 1817 -4.02 1816 -3.93 1815 -3.84 1814 -3.78 1813 -3.89 1812 -3.79 1811 -3.54 1810 -3.67 1809 -3.97 1808 -3.81 1807 -4.09 1806 -3.69 1805 -3.69 1804 -4.00 1803 -3.83 1802 -3.81 1801 -4.03 1800 -4.29 1799 -4.24 1798 -4.19 1797 -3.83 1796 -4.12 1795 -4.34 1794 -3.93 1793 -4.02 1792 -4.22 1791 -4.29 1790 -4.17 1789 -3.89 1788 -3.95 1787 -3.86 1786 -4.23 1785 -3.88 1784 -3.99 1783 -3.78 1782 -4.01 1781 -3.95 1780 -3.98 1779 -4.26 1778 -4.10 1777 -3.74 1776 -4.04 1775 -3.96 1774 -3.96 1773 -4.05 1772 -4.12 1771 -4.23 1770 -3.99 1769 -3.86 1768 -4.09 1767 -4.08 1766 -4.03 1765 -3.82 1764 -3.98 1763 -4.37 1762 -4.44 1761 -4.38 1760 -4.25 1759 -4.00 1758 -4.17 1757 -4.10 1756 -3.85 1755 -4.08 1754 -4.13 1753 -4.07 1752 -3.99 1751 -4.30 1750 -3.74 1749 -4.26 1748 -4.29 1747 -4.13 1746 -4.01 1745 -3.95 1744 -4.25 1743 -3.84 1742 -4.10 1741 -4.24 1740 -4.06 1739 -4.13 1738 -3.94 1737 -4.03 1736 -4.10 1735 -4.12 1734 -4.10 1733 -4.39 1732 -3.95 1731 -4.01 1730 -3.93 1729 -4.27 1728 -4.00 1727 -4.08 1726 -4.06 1725 -4.02 1724 -4.08 1723 -4.03 1722 -4.08 1721 -4.29 1720 -4.06 1719 -4.13 1718 -4.13 1717 -4.06 1716 -4.04 1715 -4.17 1714 -4.24 1713 -4.12 1712 -4.17 1711 -3.99 1710 -3.93 1709 -4.19 1708 -4.05 1707 -4.18 1706 -4.21 1705 -4.01 1704 -4.18 1703 -4.50 1702 -4.13 1701 -3.67 1700 -3.73 1699 -4.00 1698 -4.18 1697 -3.87 1696 -3.62 1695 -3.90 1694 -4.03 1693 -3.99 1692 -3.98 1691 -3.85 1690 -3.99 1689 -3.96 1688 -3.99 1687 -4.21 1686 -4.10 1685 -4.05 1684 -3.77 1683 -3.95 1682 -3.88 1681 -4.06 1680 -3.94 1679 -4.10 1678 -3.75 1677 -3.75 1676 -3.84 1675 -4.10 1674 -4.32 1673 -4.02 1672 -4.15 1671 -4.07 1670 -4.31 1669 -4.06 1668 -4.08 1667 -4.08 1666 -4.21 1665 -4.11 1664 -4.04 1663 -3.98 1662 -4.10 1661 -4.14 1660 -4.12 1659 -4.07 1658 -4.23 1657 -3.91 1656 -3.96 1655 -3.79 1654 -3.98 1653 -4.12 1652 -4.27 1651 -4.01 1650 -3.90 1649 -3.61 1648 -3.67 1647 -4.06 1646 -3.98 1645 -3.73 1644 -3.83 1643 -4.01 1642 -3.92 1641 -3.74 1640 -3.94 1639 -3.62 1638 -3.58 1637 -3.63 1636 -3.97 1635 -3.73 1634 -3.99 1633 -4.31 1632 -4.05 1631 -3.38 1630 -3.85 1629 -3.87 1628 -4.16 1627 -4.01 1626 -3.82 1625 -3.77 1624 -3.70 1623 -4.32 1622 -4.11 1621 -4.27 1620 -3.86 1619 -4.04 1618 -4.02 1617 -3.90 1616 -3.89 1615 -3.76 1614 -3.80 1613 -3.77 1612 -3.88 1611 -4.09 1610 -4.12 1609 -3.57 1608 -3.94 1607 -4.42