Since Shinzō Abe took office as the Prime Minister of Japan on December of 2012, the Japanese interest rate has become quite a bit more volatile relative to the period spanning the past year. The graph below shows the day to day change in interest rates calculated from Japanese Government Bonds (data from Ministry of Finance here: http://www.mof.go.jp/english/jgbs/reference/interest_rate/index.htm). The 2-year yield (blue line) in particular has been moving quite a bit, and usually downward. The 10 year yield, while always quite volatile, also has a negative bias since Prime Minister Abe took office.
