直接从网站上下载的数据，未经过任何处理。以下是网站上的数据说明. 根据需要下载相应年份的数据。
The TUV database is a worldwide unit value database developed by the CEPII.
It contains Unit Value information (in US dollars per ton) over the period 2000-2017, with 182 reporters, 253 partners, and more than 5,000 product categories per year. Import and export unit values are provided at the 6-digits level of the Harmonized System.
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