Example sentences of "over a [adj] period of years " in BNC.

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1 He went on ‘ improving ’ this poem over a long period of years so that the text usually printed shows many alterations from the original .
2 My right hon. and learned Friend the Member for Edinburgh , Pentlands ( Mr. Rifkind ) has made it unequivocally clear over a long period of years that he is wholly opposed to unilateral devolution , which is what the Bill proposes .
3 Cyclical fluctuations in the level of economic activity in an economy can be observed by examining annual changes in real national income ( or real output ) over a long period of years ; these changes are inversely related to variations in the rate of unemployment .
4 Schedule 13 , para 7(i) , Local Government Act 1972 required that where expenditure was defrayed by borrowing , a sum equivalent to an instalment of principal and interest was debited to the relevant operating statement so that the loan was repaid over a specified period of years .
5 The analogy with Munros and their associated Tops is obvious , and to collect either is likely to involve above average commitment and dedication over a sustained period of years , and require a broad spectrum of mountaineering skills .
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