Only 19 same-sex civil unions were registered to New Zealanders last year, down from 121 in 2013.
There were also 19,639 opposite-sex marriages registered to New Zealand residents in 2014, up from 19,028 in the previous year.
A further 2507 opposite-sex marriages, and 391 same-sex marriages, were registered to overseas residents.
Last year, 8171 married and 63 civil union couples divorced.
Just over one-third (35 per cent) of couples who married in 1989 had divorced before their silver (25 year) wedding anniversary.
In New Zealand, an application for divorce can be made by either partner on the grounds that the marriage or civil union has broken down irreconcilably, provided a two-year separation requirement is satisfied.
However, couples may be separated for longer than two years before divorcing or may separate and never formally divorce. Therefore, no same-sex marriages have yet been dissolved.