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年度 is the financial year (or maybe academic year if it's a research paper), so 2020年度 would the the financial year of 2020. So why do the numbers look weird? I think in your example the year is measured in eras so 30年度 would be the 30th year of the 平成 (Heisei) era. This ended with 平成31 in 2019.


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