The Global Evolution of Travel Visa Regimes.

Popul Dev Rev · 2018 · PMC6175134 · PMID 30333674

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an increasing trendno p-value reported

For the Americas and Europe, these are significantly lower, and show an increasing trend up to the mid‐1990s, after which they have started to decrease.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.