Top clinical trial participant countries worldwide 2015-16, by share

This statistic shows the distribution of the top 20 countries worldwide based on clinical trial participants in 2015-2016, by share. In the United States, there were some 31 percent of all clinical trial participants worldwide, which was the largest share amongst all the other countries.
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Top 20 clinical trial participant countries worldwide in 2015-2016, by share of participants
(in percentage)
Share of participants
United States31%
Russia5.2%
Germany4.4%
Poland3.9%
Czechia3.7%
Canada3.6%
India2.9%
Ukraine2.7%
France2.3%
Hungary2.2%
Japan2.2%
United Kingdom2.2%
Italy2.1%
Romania1.8%
Bulgaria1.8%
Spain1.8%
Argentina1.7%
China1.7%
Brazil1.6%
South Korea1.5%
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