The Danish central bank just cut interest rates for the fourth time in three weeks, taking the main deposit rate to -0.75% from -0.5%.

The Danmarks Nationalbank has been cutting rates as it attempts to defend the krone's peg against the euro.

Denmark is the last European currency still maintaining its peg as part of the European Exchange Rate Mechanism.

Last month, currency markets were sent into turmoil after the Swiss National Bank unexpectedly abandoned its own peg against the euro.

Here's the full statement from the Danmarks Nationalbank:

Effective from 6 February 2015, Danmarks Nationalbank's interest rate on certificates of deposit is reduced by 0.25 percentage points to -0.75 per cent. The lending rate, the discount rate and the current account rate remain unchanged at 0.05 per cent, 0.0 per cent and 0.0 per cent, respectively.

The interest rate reduction follows Danmarks Nationalbank's purchase of foreign exchange in the market.

Following the decision by the Swiss National Bank to discontinue the minimum exchange rate and the decision by the European Central Bank to launch an expanded asset purchase programme, there has been a considerable inflow of foreign currency.

The traditional monetary policy instruments of the fixed exchange rate policy are interventions in the foreign exchange market and influencing the interest rate spread relative to the euro area. Danmarks Nationalbank's interventions in the foreign exchange market amounted to kr. 106.3 billion in January and the rate on certificates of deposit has been lowered several times. Additionally, the Ministry of Finance has decided to suspend the issuance of domestic and foreign bonds until further notice, based upon the recommendation of Danmarks Nationalbank. These measures have been taken with the intention to inhibit the inflow of foreign exchange.

"The fixed exchange rate policy is an indispensable element of economic policy in Denmark – and has been so since 1982. Danmarks Nationalbank has the necessary instruments to defend the fixed exchange rate policy for as long as it takes," says Lars Rohde.

Lars Rohde continues: "There is no upper limit to the size of the foreign exchange reserve. The sole purpose of the monetary policy instruments is maintaining a stable krone exchange rate against the euro. The revenue of Danmarks Nationalbank is positively affected by the increase of the foreign exchange reserves."