TWI, Trade weighted exchange rate
The TWI is a nominal effective krone exchange rate calculated on the basis of NOK exchange rates against the currencies of Norway's 25 main trading partners (geometric average using the OECD's trade weights).
The index is set at 1990 = 100. A rising index value denotes a depreciating krone exchange rate.
Revision of the trade-weighted exchange rate index (TWI) (pdf)