It happens every year, but not necessarily on the same dates, both year to year and family to family, depending largely on where you or your kids go to school. Most people I know had spring break Mar 17-23 this year. It was a few weeks earlier last year.
I see. According to this [0] website spring break finished typically in mid-March last year. Perhaps that explains why the blue line in OP dips back to 0% around mid-March.
maybe Americans semi-permanently abroad assume other countries will employ reciprocal craziness, like a trade war, and are running home before they get locked up too?
Maybe US business people are traveling to other countries to compensate for the resistance or refusal of international partners to travel to a fascist state.
