There was a spike in suicides in May following the earthquake but data released by the Cabinet Office last week shows that was an aberration for the year and overall there was a 3.3% decrease in suicide numbers nationwide. This decrease also listed Miyagi and Iwate as among the top 5 prefectures to have had a decrease in numbers, Fukushima, and every other prefecture in Tohoku also registered a decrease.
The actual figures are here.
Heisei 23 (red line) = 2011
Heisei 22 (green line) = 2010
Heisei 21( blue line) = 2009
Heisei 20 (pale blue-green line) = 2008
Or in table form
For more detail and a prefectural breakdown see