Year,US_land_kmt,US_discd_kmt,Canada_land_kmt,Canada_discd_kmt,Other_land_kmt
1935,0.40,0.00,0.00,0.00,0.00
1936,0.40,0.00,0.00,0.00,0.00
1937,0.40,0.00,0.00,0.00,0.00
1938,0.40,0.00,0.00,0.00,0.00
1939,0.50,0.00,0.00,0.00,0.00
1940,0.80,0.00,0.00,0.00,0.00
1941,1.20,0.00,0.00,0.00,0.00
1942,2.10,0.00,0.00,0.00,0.00
1943,1.70,0.00,0.00,0.00,0.00
1944,2.30,0.00,0.00,0.00,0.00
1945,1.90,0.00,0.00,0.00,0.00
1946,1.20,0.00,0.00,0.00,0.00
1947,3.10,0.00,0.00,0.00,0.00
1948,7.70,0.00,0.00,0.00,0.00
1949,9.80,0.00,0.00,0.00,0.00
1950,5.30,0.00,0.00,0.00,0.00
1951,5.80,0.00,0.00,0.00,0.00
1952,5.00,0.00,0.00,0.00,0.00
1953,3.90,0.00,0.00,0.00,0.00
1954,3.90,0.00,0.00,0.00,0.00
1955,3.90,0.00,0.00,0.00,0.00
1956,2.20,0.00,0.00,0.00,0.00
1957,3.10,0.00,0.00,0.00,0.00
1958,6.10,0.00,0.00,0.00,0.00
1959,5.50,0.00,0.00,0.00,0.00
1960,5.90,0.00,0.00,0.00,0.00
1961,5.70,0.00,0.00,0.00,0.00
1962,7.70,0.00,0.00,0.00,0.00
1963,10.99,5.60,0.00,0.00,0.10
1964,14.91,4.90,0.00,0.00,0.00
1965,14.25,4.40,0.00,0.00,0.80
1966,11.34,2.10,0.00,0.00,0.30
1967,8.41,5.50,0.00,0.00,1.40
1968,12.80,3.60,0.12,0.00,1.80
1969,15.94,2.60,0.33,0.00,2.40
1970,15.51,5.53,0.07,0.00,0.30
1971,11.88,3.13,0.10,0.00,0.50
1972,14.16,1.16,0.01,0.52,2.20
1973,15.90,0.36,0.01,0.38,0.30
1974,14.61,0.98,0.01,0.62,1.00
1975,13.21,2.72,0.01,0.72,0.10
1976,11.34,3.02,0.01,0.62,0.00
1977,9.44,0.57,0.04,0.58,0.00
1978,4.52,1.67,0.07,0.69,0.00
1979,5.48,0.72,0.02,0.72,0.00
1980,6.48,0.38,0.09,0.58,0.00
1981,6.18,0.10,0.01,0.69,0.00
1982,10.62,1.38,0.02,0.50,0.00
1983,11.35,0.07,0.11,0.46,0.00
1984,5.76,0.03,0.01,0.48,0.00
1985,2.48,0.04,0.03,0.72,0.00
1986,3.04,0.02,0.06,0.36,0.00
1987,2.74,0.23,0.07,0.54,0.00
1988,1.87,0.25,0.06,0.58,0.00
1989,1.13,0.07,0.04,0.54,0.00
1990,2.75,0.82,0.03,0.49,0.00
1991,1.78,0.25,0.08,0.45,0.00
1992,2.86,1.87,0.07,0.50,0.00
1993,2.09,1.09,0.68,0.44,0.00
1994,1.59,0.16,2.14,0.44,0.00
1995,0.41,0.04,0.46,0.27,0.00
1996,0.75,0.07,0.47,0.39,0.00
1997,0.97,0.06,0.81,0.44,0.00
1998,1.82,0.12,1.18,0.71,0.00
1999,1.99,0.48,1.97,0.60,0.00
2000,3.68,0.41,2.86,0.41,0.00
2001,3.79,0.34,2.91,0.81,0.00
2002,2.53,0.25,2.64,0.49,0.00
2003,3.34,0.37,2.11,0.81,0.00
2004,6.21,0.55,0.10,0.42,0.00
2005,3.33,0.48,0.03,0.32,0.00