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                        Data retrieval:  Data are continuously 
                        updated and reviewed. To limit server overheads and download time, limits per 
                        query are 7000 records 
                        (or
                        1
                        year of data) for 
                        primary data and 
                        20 years 
                        of data for daily data. Do multiple queries to retrieve the full record. 
                        
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