They show the y-o-y increase since 1990 to 2005. As far as these numbers show, from ’96 to 2005, prices increased by a mere 82% (compared to the 200%+ in a number of california cities), but a correction hasn’t started to happen yet although the rise did start to slow since 2002. Also, interestingly prices have been on a continuous rise for the past 15 years.
One thing though, the area spans Denver to Aurora. I don’t know the Denver area well. Perhpas its covers too large an area for numbers to average out.