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In page Global Warming Solutions Act of 2006:

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These auctions demonstrate the following trends: (1) after an initial spike in qualified bidder number, the number of qualified bidders began to decrease; (2) the percentage of 2015 and 2016 allowances sold increased continually to reach 100%; (3) the percentage of current year allowances sold remained constant at 100%; (4) although the settlement prices for current year allowances initially increased, they then began to decrease; (5) the settlement prices for the 2015 or 2016 allowances have increased.[citation needed]