The civic core has several parts to it. The really hard core massive givers spend enormous time volunteering and so on. That primary core represents something like 8% of the adult population, and it has shrunk by perhaps 1% or 1.5% over a decade.
The primary and secondary core, which represent around one-quarter of the active adult population, we're not so sure about. What we think is happening is that people in the primary core are moving into the secondary core. That is to say they're giving less, volunteering less, or participating in their communities less.