You can request your complete purchase history from Amazon:

https://www.amazon.com/hz/privacy-central/data-requests/prev...

They will send you a bunch of spreadsheets and it's pretty easy to calculate your total expenditures. That showed us we were spending about $5k a year, mostly small stuff with very few purchases over $100. With Prime it was easy to order a little here and a little there. All those littles add up.

We got rid of Prime and now spend about $300 a year on Amazon. Half of that for Kindle books. We do spend a $100 a month more at Costco to make up for it. A nice side effect is that we have a lot less clutter and junk around the house.