I also found the following which similarly supports what you said:
"We continue to be asked by many people throughout the world if earthquakes are on the increase. Although it may seem that we are having more earthquakes, earthquakes of magnitude 7.0 or greater have remained fairly constant."
http://earthquake.usgs.gov/learn/topics/increase_in_earthquakes.php
In any case, I was really (initially) referring to what seems to me to be an increase in large quake activity in and around the Indonesia area over the past few decades. I kind of mixed up the two two things with that chart on activity worldwide.
Peace, FRiend.