In the last few years these numbers have been decreasing because of the recession in industry and construction. The branches of industry which contribute the most to the National Product are the electromechanical and food industries. The share of the power generating industry is increasing, while, in accordance with world trends, the shares of the raw materials branches of the industry, namely fuel, metallurgy, lumber and paper industries are decreasing.
Industry shows a tendency to concentrate in limited areas.
In Poland it is possible to distinguish over 20 industrial districts.