Year,US_land_mt,F
1982,8058.32,1.09
1983,7635.75,0.98
1984,6881.93,1.09
1985,6251.56,0.78
1986,7874.54,0.70
1987,12722.39,1.13
1988,12300.60,0.84
1989,13772.14,1.10
1990,16532.68,1.25
1991,16393.19,1.55
1992,13316.96,1.32
1993,6515.00,1.30
1994,7010.40,0.98
1995,7335.82,0.80
1996,7119.09,0.58
1997,5305.45,0.35
1998,5066.21,0.18
1999,9862.12,0.27
2000,14260.00,0.22
2001,20767.00,0.28
2002,22482.00,0.27
2003,24870.00,0.30
2004,28548.00,0.34
2005,25286.00,0.22