The catastrophic damage to the rupiah caused in 1997–1998 severely damaged confidence in the currency. Though the rupiah is a freely convertible currency, it is still regarded as a risky currency to hold. As of September 2018, the rupiah had fallen to its weakest position since the 1998 crisis with one US dollar being worth roughly IDR 14,880, peaking at IDR 15,009 on 4 September. It is one of the least valued currency unit in the world, after the Iranian rial and Vietnamese đồng.