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Erratum 1: Section PAGE REQUESTS
Server overload caused underreporting of page requests
The problem started in December 2009 and was only detected in July 2010
At that time data for April 2010 - July 2010 could still be corrected from available logs.
From Report Card July 2010 onwards underreported months December 2009 - March 2010 have been marked in the chart (greyed zone).
Underreporting was an estimated 10%-25%.
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