How many containers are there?

The Zim lost 100+ off British Columbia.
Viewing other forum topics seems like 1000+ lost in the last little bit.
The question then becomes how many are there? On board, on docks, in ground transport?
It may be like counting the stars but I thought I’d ask.

Probably …

But for what it’s worth, the top 4 manufacturers build 5.25 million boxes every year according to industry sources.