Example sentences of "[noun] over the last 30 years " in BNC.

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1 The work over the last 30 years at Wharram Percy in the East Riding of Yorkshire demonstrates how much can be learnt from consistent detailed research on one site about the development of the English landscape and of a site in its local setting .
2 Mr Briggs and his keeper have carried out most of the work over the last 30 years with help from an apprentice , part time estate workers and contractors .
3 These two questions represent the focus of a considerable amount of research by developmental psychologists over the last 30 years .
4 In a tragic testimony to the commercial success of the package holiday business over the last 30 years , melanoma now ranks as Britain 's fastest growing cancer .
5 An extensive programme of geological thin-sectioning of stone implements in various universities over the last 30 years has shown quite clearly that between 3000 and 1500 BC there were a number of heavily exploited sources of stone and flint which were used to make axes and other implements .
6 The Human Development Report 1992 released by the UN Development Programme ( UNDP ) on April 23 showed that the doubling of income disparities over the last 30 years had enabled " the richest 20 per cent of the world 's people [ to become ] … at least 150 times more than the poorest 20 per cent " .
7 But one of the striking lessons of much of social theory over the last 30 years ( picked out in Chapter 4 ) is that science — the apparently supreme epitome of rationality turns out to exhibit various kinds of non-rationality .
8 The total demand for water has increased by 70% over the last 30 years .
9 This month sees the publication of a new book by Doug Scott , recording his climbing career over the last 30 years in photographs .
10 In Benenson 's words : ‘ The gradual change over the last 30 years in the public perception of the value of human life is a measure of Amnesty 's influence .
11 It may be that ‘ no action ’ would turn out to be a very wise option based on the experiences of miniaturisation over the last 30 years or so .
12 Situated on the edge of the attractive village of Tiffield , Ark Farm has evolved from a number of farms over the last 30 years .
13 Irrigation and agricultural policies — especially for the Soviet cotton industry — meant that the water level in the Aral Sea had fallen by over 14 metres over the last 30 years .
14 The work at Wharram Percy reflects the development of medieval rural settlement studies in England and our understanding of the implications of the development of the landscape over the last 30 years .
15 The amount of silt that the Huanghe brings to the China Sea ( 1.6 × 10 t per year ) represents a 25 per cent increase over the last 30 years and is due mainly to the conversion of grasslands to arable fields ( Smil 1987b ) .
16 It claimed a transformation in the status of embroidery over the last 30 years , from ‘ genteel craft for women ’ to the Art of an ‘ avant-garde ’ on ‘ the cutting edge ’ with ‘ a new spirit of self-expression and innovation ’ .
17 Such comments about the DTI 's effectiveness as a corporate policeman could have been made almost at any time over the last 30 years and in a multitude of cases .
18 There is no reliable estimate of abundance for the franciscana , although the incidental gill-net kill of tens of thousands of dolphins over the last 30 years has undoubtedly significantly reduced the total population .
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