www.stat.fi/til/ttvi/2017/08/ttvi_2017_08_2017-10-10_kuv_002_en.html
... 2017, August. Statistics Finland Inquiries: Kari Rautio 029 551 2479, Maarit Mäkelä 029 551 3324, volyymi.indeksi@stat.fi Director in charge: Sami Saarikivi Updated 10.
10/10/2017