UNdata数据库中的Series列是什么意思？

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联合国数据库中，有一列为Series，相同国家、年份的数据，由于Series列的不同（比如Series为200、300等），数值差异也会很大。但是这个Series究竟是什么意思？希望高人解答，谢谢！
以下是一个例子，网址为：
http://data.un.org/Data.aspx?d=SNA&f=group_code%3a406%3bitem_code%3a31

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关键词：UNdata Series Serie 是什么意思 Data Series 数据库

已解决：
Different series numbers (column “Series”) are used to store different time-series versions of national accounts statistics. Series numbers with two digits (10,20) refer to data compiled following the 1968 SNA national accounts methodology, while series numbers with three digits (100, 200, etc) refer to data compiled using the 1993 SNA national accounts methodology, and series numbers with four digits (1000, 1100, etc) refer to data compiled using the 2008 SNA national accounts methodology. In addition to different methodologies, different series numbers are used when data are reported in different currencies, fiscal years, or by different sources. Furthermore, data are stored under a new series number whenever there are significant changes in compilation practices which make the time series no longer comparable.