. No fiat currency has suffered such a crash. The worst performing fiat currency is the Ukrainian Hryvnia, which has seen its value dropping by 60%.
*ahem* Deutchmark under the Weimar republic. Venezuelan dollar in 2005. Zimbabwean dollar around the same time... I can come up with others. Where BTC did better, is that it did bounce back.
It may also be instructive to point out that the most successful fiat currency of all time -- the USD -- has lost 97% of its value since its inception.