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trends timeline for 1952%E5%B9%B4%E3%81%AE%E6%AF%8D%E6%80%A7%E4%BF%9D%E8%AD%B7%E6%9D%A1%E7%B4%84%E3%81%AB%E9%96%A2%E3%81%99%E3%82%8B%E6%94%B9%E6%AD%A3%E6%9D%A1%E7%B4%84%20-%20Maternity%20Protection%20Convention,%202000