Site is slow and not all graphs are loading, here's a SS I took of it with both this years and last years graph:
What is the bottom graph representing?
EDIT: Looks like data from a little over a year ago- The date range in the screenshot is from Dec 4th to 5th 2010.
Other text: "100 CPM is equivalent to exposure of 1 micro-sievert per hour". Or, approximately one tenth your rate of exposure when flying commercial.