I looked for something like this yesterday, and came across this dashboard with trends for the Port of LA only: https://signal.portoptimizer.com/ which seems to be a port activity dashboard (demo with real data) for the port of LA via portoptimizer.com
You'll see the trends don't seem so bad yet, but they have a previous-12-weeks graph of current year vs previous year which will be interesting to follow
Longer term trends would be nice.