(Bloomberg) -- Yen traders looking to navigate a smooth handover of power at the Bank of Japan face an added complication from fiscal year-end flows which traditionally weigh on the currency.

The yen has just entered a traditionally weak time of the year, which lasts until early April, according to historical data compiled by Bloomberg. The data show the Japanese currency falling over 0.6% against the dollar from mid-February through April 5 on average over the last 30 years.

That’s a period that will cover government hearings with the nominee to be the next BOJ governor, Kazuo Ueda, as well as the last meeting from the current head Haruhiko Kuroda.

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The seasonal weakness is not random and is related to flows into the Japanese fiscal year end on March 31, wrote Brent Donnelly of Spectra Markets, in a note this week.

“I have seen the flows at various banks over the years and thus I am a big believer in this seasonal anomaly,” he wrote.

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