The given table elucidates the change in the number of residents in New Zealand between 2011 and 2012 according to distinct age cohorts.
Broadly speaking, it is apparent that people in the 15-39 age group made up the largest part of the total New Zealand population, but the elderly had the most significant increase after the two analyzed years.
To commence, it is clearly seen that individuals from 15 to 39 exhibited the highest number among the four demographic segments in both years. However, it experienced a slight decrease in 2012, from over 1,575,000 to just under 1,575,000 residents. Additionally, the number of children showed uniformity with the category above, falling moderately from 898,160 to 896,364.
Turning to the other specific age ranges, it is notable that persons above 65 years old saw the most noticeable progress, with a 4 percent increase, from 573,946 to 596,903 people. Moreover, the dwellers in the 40-64 age group also had a gradual improvement in the number of people, with around 8,000 persons. Consequently, the population of New Zealand showed a slight growth after a year.