If by this question you mean it's below-replacement Birth Rate then this is not just Japan's issue. It's not really a problem because even if the population declines on average at 1% a year it would take decades to have any real effect.
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what is the population of japan in 2009
In 2014, the population of Japan was estimated at 126,434,964.
The population of CGC Japan is 334.
Japan Post's population is 2,006.
Sompo Japan's population is 16,095.
Japan Tobacco's population is 2,011.
In Japan
No. Japan population = 126,434,964 US population = 320,206,000
No. Japan population = 126,434,964 US population = 320,206,000
No. Japan population = 126,434,964 US population = 320,206,000
According to the CIA World Factbook, in July 2008, Japan's population was 127,288,416. Australia's population at that time, by comparison, was 21,007,310, which is about one-seventh of Japan's population.