Year           Harvested         Yield         Production
                -acres-        -bu/acre-        -bushels-
1960             3,000           44.3            132,900
1970             1,700           50.0             85,000
1980             8,900           47.0            451,000
1985            18,600           84.2          1,567,000
1990             7,100           88.0            625,000
1991             8,700           94.0            818,000
1992            10,900          108.3          1,181,000
1993             9,000           80.6            725,000
1994             8,000           91.0            728,000
1995             8,000           88.5            708,000
1996            13,300          103.1          1,371,000
1997             8,400           98.0            823,000
1998             6,400           95.2            609,000 

Source: Missouri Agricultural Statistics Service