Japan Prime Minister Resigns

Tonight's TV programs were interrupted by a broadcast by the current prime minister Yasuo Fukuda announcing that he is to resign.
Since I came into contact with Japan, I noticed that the prime minister seemed to changed with the seasons - all the time ^^;
They really don't last long here and receive a bashing from everyone as soon as they are appointed as prime minister.

Does your prime minister/president change with the seasons too?
Image from ABC, News from the TV