The main reason is New Zealand has interest rate higher than the rest of world.
However. Kiwi still be under pressure.
Next week, main focus is NZ CPI on Tuesday. If it's positive, Kiwi gains support and halt the downtrend ; on the other hand, if CPI is negative, N/U continues its downtrend. I lean to downtrend than a pause.
Technical viewpoint, NZDUSD broke SMA100 and I draw on the chart proving that N/U is under strong pressure.
NZDUSD also breaks strong support around 0.6450
I expect N/U continues its downtrend to 2015 year low at 0.6235