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A period appearing more than once was revised.","vintages":[{"period_start":"2008-04-01","period_end":"2009-03-31","period_label":"Year ending March 2009","value":150.83900000000003,"status":"final","vintage":"2026-03-26","release_label":"Historical official forecasts database, March 2026","source":{"sheet":"IT","table":"IT","row":"Outturn data*","column":"2008-09","raw_value":"150.83900000000003"}},{"period_start":"2009-04-01","period_end":"2010-03-31","period_label":"Year ending March 2010","value":147.14800000000002,"status":"final","vintage":"2026-03-26","release_label":"Historical official forecasts database, March 2026","source":{"sheet":"IT","table":"IT","row":"Outturn data*","column":"2009-10","raw_value":"147.14800000000002"}},{"period_start":"2010-04-01","period_end":"2011-03-31","period_label":"Year ending March 2011","value":153.246,"status":"final","vintage":"2026-03-26","release_label":"Historical official forecasts database, March 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