Example sentences of "[noun] over [art] 20 [noun] period " in BNC.

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1 We are extremely critical of the strategy outlined in draft guidance because it seeks to meet a projected near doubling in aggregates consumption over the 20 year period 1991 to 2011 .
2 We are extremely critical of the strategy outlined in draft guidance because it seeks to meet a projected near doubling in aggregates consumption over the 20 year period 1991 to 2011 .
3 In conclusion , this study shows an absolute increase in the incidence of proximal gastric tumours in a defined population over a 20 year period .
4 In the South Wales region it is expected that the annual quantity required from this source will rise from about 2.8 mt to 3.6 mt over the 20 year period , despite the fact that as a proportion of overall consumption it will fall from 15% to 10% .
5 In the South Wales region it is expected that the annual quantity required from this source will rise from about 2.8 mt to 3.6 mt over the 20 year period , despite the fact that as a proportion of overall consumption it will fall from 15% to 10% .
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