Example sentences of "decline [prep] [noun sg] [noun] over " in BNC.

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1 One of the main reasons for the poverty trap is the decline of tax thresholds over the years , as well as the relatively heavy rates of direct taxation on low incomes .
2 The study will also take into account the effects of aging , which may contribute to a decline in knowledge retention over a long period .
3 It is , however , harder to explain purely in the context of the theory of contestable markets why some firms ' eurobond operations have continued to be successful while others have been unable to establish themselves , why there has been no significant decline in market concentration over time despite continual new entry , and why profitability has declined so steeply .
4 While prices were forcast to fall by about 10 per cent on average next year , a slow decline in interest rates over the next 12 months was seen as prompting a resurgence the following spring .
5 In these respects , there has been a general and continuing decline in prison conditions over a long period of time ( King and McDermott , 1999 ) .
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