Manufacturing production in many OECD economies has declined in recent decades so that, on average, services now account for about 70% of OECD GDP. In fact, in the United States and the United Kingdom, employment in manufacturing industries is now less than 10% of total employment. As part of this general decline, the scope and nature of manufacturing has changed so that what was once dominated by skilled trades and vocations, machine operators, assembly line workers, etc., now relies increasingly on service occupations and service inputs. This reflects the increasing use of technology in production, international sourcing of more sophisticated intermediate inputs and a range of social factors (such as the changing skill composition of populations).