The concept of securitization is generally associated with the Copenhagen school of security studies, which is generally taken to include Ole WÃ¦ver, Barry Buzan, and a range of other, more loosely associated, researchers.
Average annual number of employed coal miners in the United States, 1890-2014. US employment in coal mining peaked in 1923, when there were 863,000 coal miners. Since then, mechanization has greatly improved productivity in coal mining, so that employment has declined at the same time coal production increased. The average number of coal mining employees declined to 65,400 in 2015.
Number of people employed in the coal mining industry in the United Kingdom (UK) from 1920 to 2015 (in 1,000 employees) About This Statistic. This statistic shows the number of people employed in the coal mining industry in the United Kingdom (UK) from 1920 to 2015.