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By Se Young Lee SEOUL (Reuters) - Samsung Electronics Co Ltd is closer to losing its crown as global smartphone leader after posting a plunge in quarterly mobile earnings on Thursday, a day after rival Apple Inc reported the biggest profit in corporate history. It was the mobile division's fifth consecutive quarter of decline, in contrast to Apple's record-breaking 74.5 million iPhone sales in the three months to Dec 27 on the back of the success of its big-screen iPhone 6 and 6 Plus. Analysts say Samsung is under immense pressure to hang on to its market share, with a lot resting on the launch of its next flagship Galaxy S6 high-end smartphone due around March. While Samsung did not release smartphone sales figures, it said smartphone and tablet shipments declined in the fourth quarter, leading some analysts to declare Apple had caught up.