The graph shows how monthly UK institutional repository deposits have doubled in the last 18 months. Each repository was receiving an average of 40 deposits per month in October 2006 and is now receiving about 80 deposits per month in April 2008.The data is taken from ROAR and is corrected for some obviously anomolous activity and for some missing deposit data. Further investigation is required to check whether the trend applies to all repositories or whether it is driven by a small number of better preforming repositories. Work is also required to determine seasonal variations and also to understand longer-term trends.
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