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Figure 13.5--Industrial wood productivity in the United States, 1900 to 1998 (Ince 2000).

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Industrial wood productivity (Industrial wood product output per unit of roundwood input in pounds per cubic foot), by year:

Year	(lb/ft3)
1900	18.31
1901	18.45
1902	18.59
1903	18.70
1904	18.61
1905	18.65
1906	18.69
1907	19.15
1908	19.28
1909	19.23
1910	19.31
1911	19.33
1912	19.18
1913	19.22
1914	19.41
1915	19.51
1916	19.37
1917	19.56
1918	20.10
1919	19.86
1920	20.05
1921	20.14
1922	19.49
1923	19.19
1924	19.34
1925	19.03
1926	19.27
1927	19.46
1928	19.44
1929	19.45
1930	20.07
1931	20.95
1932	22.05
1933	21.14
1934	20.83
1935	20.33
1936	20.03
1937	19.84
1938	19.87
1939	19.68
1940	19.01
1941	19.24
1942	18.94
1943	19.41
1944	19.37
1945	19.97
1946	19.58
1947	19.56
1948	19.17
1949	19.18
1950	19.44
1951	19.12
1952	18.59
1953	19.20
1954	19.12
1955	19.64
1956	19.16
1957	20.14
1958	20.67
1959	20.80
1960	19.98
1961	20.53
1962	20.71
1963	20.93
1964	20.91
1965	19.71
1966	20.03
1967	20.14
1968	20.13
1969	20.57
1970	20.35
1971	20.65
1972	21.53
1973	21.83
1974	21.46
1975	21.87
1976	21.74
1977	22.09
1978	22.22
1979	22.12
1980	22.64
1981	23.24
1982	22.95
1983	22.97
1984	23.39
1985	23.26
1986	22.81
1987	23.06
1988	23.45
1989	23.77
1990	23.99
1991	24.42
1992	24.83
1993	25.46
1994	25.80
1995	25.57
1996	26.08
1997	26.07
1998	26.15