The RBNZ has announced new weightings for the trade-weighted index

As of Wednesday 17 December 2014:

  • the number of currencies included in the TWI will be increased from five to 17;
  • the weights for each currency will be based on the two-way trade in goods and services between the foreign country and New Zealand;
  • the TWI-17 will have a base of 31 October 2014 = 76.4400, which was the level of the existing TWI-5 on that day

More at the Reserve Bank of New Zealand