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In the past twenty years, Japan has had over ten leaders.

In fact, a specialist compares assuming the nation's top job to taking a "cursed cup".

But why does Japan keep changing leaders? This is partly because of it being a "one-party democracy", says Prof James Brown of Temple University in Japan.

The LDP's grip on the political landscape means the main political competition originates within the party, instead of from opposition groups.

"Therefore inside the LDP there are vicious struggles within various groups - they all want their own faction to get the leadership position."

"Thus although you might be selected as leader, as soon as you're in office, you have many individuals scheming to try to get you out again."

Key Factors Behind Frequent Changes

• Single-party rule limits external competition
• Party infighting drive leadership contests
• The prime minister's position is often described as a "poisoned chalice"
• Government continuity stays elusive despite economic strength