I did know that. I don't remember it offhand.
Businesses begin to make adjustments when they anticipate that there could be uncertainty. They don't necessarily wait for the disruption, so there have been impacts as people seek to mitigate risks when they anticipate there is a vulnerability and an uncertainty as to the outcome. That's true, I would submit, of any bargaining situation.
The last actual strike, I think, was some time ago. I don't recall precisely.