I might be wrong, but this chart tells me it's barely moved in the last several quarters:
I think your data is a bit off. Manually take a look @ the last 4 quarters. I see some big moves 2 earnings ago which does not show up on your chart. The gap was 2% and the move was almost 4%
Liquidity just came in on the wings get in on the synthetic fly on DHR!! Vol is way to expensive here.