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The WDI Database Archives (WDI-DA) contains previous versions of the World Development Indicators database, including indicators that have been discontinued. Data are drawn from all available electronic releases going back to 1989. Users should exercise caution when comparing data from different versions, as the same codes have been used to reference series with different base years or different valuations of a country's local currency. For example, the series code for constant US dollar GDP (NY.GDP.MKTP.KD), which is currently based in 2015, has been used in previous editions when the base year was 1987, 1995, 2000, 2005, and 2010. Please note that when an indicator is available in the WDI Archives and in the current WDI database, only the current metadata for this indicator is available in both databases. We will be working to improve the usability of the archives by harmonizing codes and names to the extent possible and adding additional metadata.
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