(1) Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), trade data for which can accessed here: https://trade.cites.org/
(2) According to this 2020 report by Four Paws, European authorities (including those outside the EU, such as Montenegro) reported 913 captive tigers in Europe in 2018/2019. The 850 figure is a result of subtracting the countries outside of the EU and UK from this total.
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