Meanwhile, the Darent, in Kent, is at extremely low levels, as is the Wye in Surrey.
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While it is facing extremely low levels of inflation, it hasn't managed to pull the housing market up.
And yet this is when investment returns are at historically extremely low levels.
Interest rates have started to reverse course, ticking up from extremely low levels, and prices have started to soften.
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For now, Federal Reserve policy-setters have indicated that they envision the federal-funds rate remaining at extremely low levels until late 2014.
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So we've seen extremely low levels of unemployment that really weren't natural.
Encouragingly, in these children long-term control of HIV replication following early antiretroviral treatment has resulted in extremely low levels of virus and diminished anti-HIV immune responses.
By hatching its own fish, carefully controlling feed and raising fish offshore in clean water, mercury and other pollutants can be kept to extremely low levels, contends Spencer.
The FOMC has kept rates at extremely low levels since December of 2008 in a dramatic effort to mitigate the financial crisis and stimulate growth, and those levels will probably remain so long as U.S. unemployment stays at its historic highs and the committee doesn't see any near-term inflation threats.
But there is good reason to think that the market has not yet peaked: the northern hemisphere's winter is only now approaching, heating oil stocks are at extremely low levels on both sides of the Atlantic, and the price of natural gas (oil's chief rival for home heating) has lately gone through the roof.
Investor sentiment, always very bullish at market tops, and very bearish at market lows, was at extremely bearish levels at the low in early 2009, convinced the market could only go lower.
There are countries with extremely low fertility and extremely high levels of innovation (Hong Kong, Singapore), countries with a moderate level of fertility and moderate to high amounts of innovation (United States, Israel), and countries with both low fertility and low levels of innovation (Italy, Greece).
Its share in Rural China is extremely low, if probably non-existent, given the low income levels in those regions.
The backscatter machine "delivers an extremely low dose of ionizing radiation" with levels "below the acceptable limits, " the report stated.
Secular bull markets, typically, start from levels of valuation that are extremely low and associated with despair, not blind-optimism.
Mr Dolan said a study by the National Radiological Protection Board had said exposure levels from living near masts were "extremely low", with the overall evidence suggesting they were unlikely to pose a health risk.
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Now featuring both Automatic and Manual gain settings, users can enable Mikey Digital to intelligently adjust to fluctuating volume levels or manually set low sensitivity for extremely loud sources and high sensitivity for quieter sources.
However, high levels of unemployment mean the country's tax and revenue base remains extremely low.
Clearly these results were cast against extremely weak sales data from a year ago, but the expectations had already baked in an improvement from these low levels.
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