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The author’s work used the data from the World Bank’s data source, https://data.worldbank.org/indicator/TX.VAL.TECH.MF.ZS?view=chart
TEA East Asia & Pacific (IDA & IBRD countries), CHN China, USA United States, EUU European Union, TLA Latin America & the Caribbean (IDA & IBRD countries), TSS Sub-Saharan Africa (IDA & IBRD countries)
