The number of tobacco farms in the U.S. has gone from 415,315 in 1959 to 10,014 today.
"Tobacco-Farms and Acres, by Acres Harvested, Quantity Harvested, and Value of Crop for Tobacco, for Selected States: 1964 and 1959." U.S. Department of Agriculture. Table 59.http://usda.mannlib.cornell.edu/usda/AgCensusImages/1964/02/04/747/Table-59.pdf
"Specified Crops by Acres Harvested: 2012 and 2007." U.S. Department of Agriculture. 2012. Table 37.http://www.agcensus.usda.gov/Publications/2012/Full_Report/Volume_1,_Chapter_1_US/st99_1_037_037.pdf