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In the past twenty years, the country has had more than 10 leaders.

In fact, one expert likens taking up the nation's highest office to taking a "cursed cup".

However, what is the reason does Japan keep changing leaders? It's due in part of it being a "one-party democracy", explains 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, rather than from external parties.

"Therefore inside the LDP there are intense conflicts within different factions - they all desire their own clique to secure the leadership position."

"So even though you might be chosen as leader, the moment you're in office, you have dozens of people manoeuvring to try to remove you again."

Key Factors Behind Frequent Changes

• Single-party rule restricts outside challenges
• Party infighting drive leadership contests
• The prime minister's position is often described as a "cursed position"
• Government continuity remains difficult to achieve despite economic strength