Later, as sheep farming declined, the area fell into poverty.
Over the years, farming declined in importance, and village fishermen have increasingly been routed by huge and more efficient factory ships.
With farming declining across the country, tourism has edged ahead as the primary revenue-earning sector.
As farming declines in Sierra de la Culebra in northwestern Spain, the area has returned to wilderness, and wolves have returned with it.
MPP, which produces 100,000 pigs each year from its six existing farms, declined to elaborate on its future plans.
The number of tobacco farms declined from 180,000 in the 1980s to just 10,000 in 2012, according to the US Centers for Disease Control and Prevention.
Unfortunately, as demand went up, the number of organic producers and the acreage of organic farms declined, leading to fears that soon demand would outstrip supply.
A central theme of this census appears to be a hollowing out of the middle: All categories of midsize farms declined over the past five years.
The number of farms declined by about one-third between 1950 and 2000, and employment in farming and its related industries has dropped to only a tiny fraction of the state's workforce.
It will be critically important for the F.D.A. to monitor whether drug companies change their labels and whether use of the drugs on farms declines over the next few years.
