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

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1 The average trend for the second-highest maximum one-hour ozone concentration recorded at 400 sites shows that ozone levels increased by 2 per cent over the 1979–88 period but decreased by 14 per cent over the 1980–9 period ( figure 8.8 ) .
2 The average trend for the second-highest maximum one-hour ozone concentration recorded at 400 sites shows that ozone levels increased by 2 per cent over the 1979–88 period but decreased by 14 per cent over the 1980–9 period ( figure 8.8 ) .
3 These included a reduction in value added tax from 18 to 17 per cent at the start of 1993 and a 4 percentage point cut in the corporate tax rate to 36 per cent spread over the 1993-97 period .
4 A MAFF study in Staffordshire showed that over the 1978–81 period , 246 larger farmers ( 500 smds or above ) spent an average of £4,419 on capital works ( grant-aided ) while 202 smaller farmers ( 150–250 smds ) spent an average of only £328 .
5 Investment over the 1992–1994 period at £5.4 billion is forecast to be 22 p.c. down on the 1989–91 levels after allowing for inflation and the lowest since 1984–86 but still 30 p.c. higher than the depth of recession in 1981–1983 .
6 Investors are risk averse and maximize their return ( as measured by the rate of return ) over a one period time horizon .
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