Earthquakes in Japan and around the world (II)

Following on my last post, this figure shows the cumulative numbers of earthquakes with magnitude of 5.0 or greater that are not in the Japan region. It would be better to have a longer sample from before the 2011 Tohoku earthquake, but based on what I do show, and not using any sophisticated statistical tests, there is not an obvious change in rate at the time of the 2011 Tohoku earthquake.