Decreased hail size in China since 1980.

Sci Rep · 2017 · PMC5589923 · PMID 28883644

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a decreasing trendno p-value reported

2 , the annual mean size of 20+ mm hailstones displayed a decreasing trend of 1.7 mm per decade, significant at 99% level.

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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.