Any hook for when the server shuts down?

I have my own money system on my server.
When the server loads it loads the file containing the money(s?) in this format:

<steamid1> <moneyamount>
<steamid2> <moneyamount>

I need to make it so that when the server closes it saves all of the money back to the file.
However after searching the garrysmod wiki I couldn’t find a hook for this.

Any ideas?

GM:ShutDown

You god damn well did not search the wiki for that.

That’s strange, I went to the hooks page and used Ctrl+F to find Shut and nothing popped up.
Thanks!