Annual glacier ice volumes (in cubic km.)

From 1978 to 2020, New Zealand's glacial ice volume experienced a 35% reduction, with the annual rate of loss accelerating over time. The overall volume of ice in New Zealand's glaciers shrank from 53.3 km³ in 1978 to 34.6 km³ in 2020. The most significant yearly ice loss took place in 2018, with a total of 2.7 km³ lost. The years 2019 and 2011 saw the second-highest annual ice losses, both witnessing a reduction of 2.5 km³.