system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do countries print new currency (notes & coins) every year, and how do they decide the amount that is made.
gpt
The population of the US, and almost every country is growing, so more people need more money.

They also destroy damaged money every year, and have to replace it.

The federal reserve will keep a supply of extra bills, and send them to banks when needed.  If they are running low on cash, they order more from the mint or the Bureau of Engraving and printing.