This is done for a few clicks: Help → Support Steam → My Account → Data related to your Steam account → External funds. Even if you do not pay the TotalSpend line, a total amount of dollars will be displayed:
Some commentators learned that tens of thousands of dollars were leaked to the library. But on average, users spend a few hundred and a few thousand. They also remembered the traditional discount traps: “The game cost only $ 1, but finally a few mortgages ran.”
If you are ready to find the truth, see your account. An unpleasant surprise can expect.
Source: Ferra

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