In an attempt to change deflationary expectations, the Bank of Japan stated that it would continue to target reserve accounts until the core consumer price index showed a twelve-month inflation rate of zero or above. Over the roughly two years since then, reserve accounts at the Bank of Japan have risen nearly six-fold, from ¥ trillion in March 2001 to about ¥ trillion today.
In addition, since March 2001 the Bank of Japan has increased the monthly amount of its outright purchases of long-term government bonds from ¥ billion to ¥ trillion. I assume that these monetary policy actions have provided some support for economic activity.