In parallel to this process, which has seen a very large number of small-scale natural habitats disappear in the farmland landscape, the diversity of the farming activities on the individual farms has decreased significantly as well, resulting in much more specialized farms. As an example, the number of farms raising pigs has decreased from 120,000 in 1970 to 4,600 in 2011 and the average number of pigs per farm has increased from 70 to 2800 in the same period. At the same time, there has been an increasing tendency to keep livestock inside all year around.