publications - Why don't major research institutions systematically publish their subscription fees to scientific journals?

I read on https://ropengov.github.io/r/2016/06/10/FOI/:

Finland becomes to our knowledge the first country where annual subscription fees for all individual publishers and all major research institutions have been made available.

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Limited access to detailed pricing information and agreement details are likely to result in suboptimal contracts (Cockerill, 2006; Shieber, 2009). Improved access to subscription costs can hence be expected to lead to better deals and lower costs for the universities. It can also facilitate transition to the Open Access (OA) publishing model.

Why don't major research institutions systematically publish their subscription fees to scientific journals?

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