Age	Depth
2000	23.6
1999	43.5
1998	47.32
1997	52.19
1996	54.86
1995	57.93
1994	60.77
1993	65
1992	69.3
1991	72.9
1990	74.8
1989	77
1988	80.3
1987	84
1986	90.9
1985	97.7
1984	99.4
1983	101.5
1982	103.1
1981	104.4
1980	105.5
1979	106.9
1978	108.2
1977	109.3
1976	110.2
1975	112.8
1974	115.6
1973	116.8
1972	117.8
1971	119.4
1970	121.3
1969	122.6
1968	123.9
1967	124.5
1966	125.1
1965	126.6
1964	127.8
1963	128.8
1962	130
1961	130.3
1960	131.4
1959	132.3
1958	133.5
1957	135.1
1956	139.7
1955	141.4
1954	142.7
1953	144.2
1952	145.9
1951	147
1950	148.1
1949	149.1
1948	150
1947	151
1946	153.3
1945	154.7
1944	155.9
1943	157.4
1942	158.4
1941	159.9
1940	161.1
1939	162.8
1938	163.8
1937	165.6
1936	166.9
1935	167.8
1934	168.6
1933	169.5
1932	170.6
1931	171.8
1930	173
1929	174.1
1928	174.9
1927	176
1926	176.7
1925	177.4
1924	178.3
1923	179.6
1922	180.4
1921	182.1
1920	182.9
1919	183.6
1918	184.8
1917	185.7
1916	186.9
1915	188.1
1914	189.1
1913	189.9
1912	190.9
1911	191.7
1910	192.5
1909	193.5
1908	194.1
1907	194.7
1906	195.5
1905	196.3
1904	197.4
1903	198
1902	198.8
1901	199.6
1900	200.4
1899	201.1
1898	201.6
1897	202.3
1896	203.3
1895	203.9
1894	204.6
1893	205.7
1892	206.6
1891	208.2
1890	209.2
1889	210.7
1888	211.4
1887	212.4
1886	213.7
1885	214.6
1884	215.6
1883	216.7
1882	217.6
1881	218.4
1880	219.4
1879	220.2
1878	221.4
1877	222.2
1876	223
1875	223.8
1874	224.4
1873	225.6
1872	226.4
1871	227.6
1870	228.4
1869	229.8
1868	231
1867	232.4
1866	234.2
1865	240.6
1864	242.1
1863	243.2
1862	244.7
1861	245.8
1860	246.5
1859	247.3
1858	248.1
1857	248.9
1856	249.8
1855	250.6
1854	251.9
1853	252.9
1852	254.1