Eighty percent of Japan's Toyota Motor 's (nyse: TM - news - people ) profits come from the U.S. market.

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Corporate earnings will be a focus in Japan, with major companies including Toyota Motor Corp.

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The business depends on exports for 50% of its business, and the other 50% may not be so secure given that a stronger yen and an aging population are leading some companies to shift production out of Japan, including the likes of Toyota Motor.

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Toyota Motor has been in a free fall ever since the March natural disasters in Japan.

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Toyota Motor Corporation announced its Q1 earnings for fiscal 2013 which were buoyed by strong performances in Japan and North America.

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Toyota Motor rose 3%, also aided after the firm revised up its 2012 sales plan for Japan.

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Toyota Motor Corp. has for a long time produced at least three million vehicles a year in Japan with around half of these destined for overseas buyers.

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