On 18 December 2014, the Swiss central bank introduced a negative interest rate on bank deposits to support its CHF ceiling. However, with the euro declining in value over the following weeks, in a move dubbed "Francogeddon" for its effect on markets, the Swiss National Bank abandoned the ceiling on 15 January 2015, and the franc promptly increased in value compared with the euro by 30%, although this only lasted a few minutes before part of the increase was reversed. The move was not announced in advance and resulted in "turmoil" in stock and currency markets. By the close of trading that day, the franc was up 23% against the euro and 21% against the US dollar. The full daily appreciation of the franc was equivalent to $31,000 per single futures contract: more than the market had moved collectively in the previous thousand days. The key CHF interest rate was also lowered from −0.25% to −0.75%, meaning depositors would be paying an increased fee to keep their funds in a Swiss bank account. This devaluation of the euro against the franc was expected to hurt Switzerland's large export industry. The Swatch Group, for example, saw its shares drop 15% (in Swiss franc terms) with the announcements so that the share price may have increased on that day in terms of other major currencies.