By relatively few, of the 222 refineries killed in lowsec as of now, 35% have been fitted.
Depending on perspective, that seems to be a fairly large percentage.
However, the Christmas/New Year period may be affecting that, since there is a definite change in the unfit/fit loss rate by week, but much lower numbers over the current period:
The last week there is the current one, so doesn’t end until Sunday night.
I’m not sure of the significance of when they are killed (ie. in anchoring, or afterwards), but it will be interesting to monitor for a few months to get some better data.