HELP: Grain Hopper Chronology

About 20 years ago, when I was looking at Pullman-Standard PS-2CDs, I noticed that their volumes increased over the years. So I made the following chart based on the cars belonging to BN. Recently, I have become interested in North America as a whole, including Canada, and I wanted to recreate this chart. I don’t have detailed data. I would be grateful if you could provide it.

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