The data are taken from external data bases (GDP in PPP GK 1990 $US, and labour hours from The Total Economy database, DMC from IFF database, WI database, and Eurostat, Total primary energy supply from the Energy Balances of the IEA database).
index1970=100 (for EU15 countries), and index1992=100 (for other countries)
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This will reduce wear and tear on them and increase their longevity, thereby saving money. It also saves precious raw material: it takes 27 litres of crude oil to produce a new tire. Under-inflated tyres also increase fuel consumption by up to 10%. Check your tyres at least once a month. It takes but a few minutes.
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