Franc
The Swiss franc (ISO code: CHF or 756), which appreciated significantly against the new European currency from April to September 2000, remains one of the world's strongest currencies, worth today around five-sixths of a euro. The Swiss franc is used in Switzerland and in Liechtenstein. Liechtenstein retains the ability to mint its own currency, the Liechtenstein franc, which it does from time to time for commemorative or emergency purposes.
Currency intervention
As investors flocked to the franc during the financial crisis, they dramatically pushed up its value. An expensive franc may have large adverse effects on the Swiss economy; the Swiss economy is heavily reliant on selling things abroad. Exports of goods and services are worth over 70% of Swiss GDP. To maintain price stability and lower the franc's value, the SNB created new francs and used them to buy euros. Increasing the supply of francs relative to euros on foreign-exchange markets caused the franc's value to fall (ensuring the euro was worth 1.2 francs). This policy resulted in the SNB amassing roughly $480 billion-worth of foreign currency, a sum equal to about 70% of Swiss GDP.