Its simply because both Japan and the U.S. are far behind Korea, who has been shipping reactors all over the world after Fukushima, and they are the only country to increase installations since.
India: https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails....
Pakistan: https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails....
China: https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails....
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Finland: https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails....
Belarus: https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails....