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More than half of the self-employed received their main income from wages and pensions in 2004 . This illustrates the difficulty encountered by carrying out comparisons of income level and distribution across immigrant groups . One of the questions that 's plagued us as we looked at this is this question of which tires one would choose to recall and which tires one would use to replace them , and the confusing sets of data that I 'm sure you needed to rely on to some extent and were confronted with . I , like others on the committee , have interests on both sides of this issue , having constituents that are directly involved with both Firestone and Ford . One must , however , take into consideration that 60 per cent of this group were between 16 and 25 years old ( based on the 16 to 74 years population ) . The group ' other state university colleges ' , consisting of Oslo and Bergen 's arts academies and Norway 's police college , produced a high 50 credits per active student . For NBC , the recent changing of the guard also makes a move toward the Web more palatable .