From the Algora Blog

The United States currently produces 14,000 155mm artillery shells per month, and plans to increase this to 90,000 in 2024.

Russia, meanwhile, produced 1.7 million until beginning of 2022, increased their rate to 3.3 million in 2022, and further plans for 5 million per annum by 2024.

So thats roughly 1 million to 5 million artillery shells per year

What will be left of Ukraine after these 6 Million Shells are deployed this year ?