The given table provides data on the total population of New Zealand as well as its distinct age groups surveyed from 2011 to 2012. Overall, the information indicates that New Zealand is showing signs of the aging population, as the data for people under 39 had decreased slightly during the period mentioned, while the opposite trend was true for the older groups.
In terms of the total population, including all ages, the number had risen relatively by 0.6% from 4,381,269 to 4,410,284. Apparently, the two age groups, comprised of those under 15 and between 15 and 39, showed a decrease of the same rate (0.2%), starting at 898, 160 and 1,577,256 individuals before down to 896, 364 and 1,574,102 individuals, respectively.
In contrast, the groups of citizens aged from 40 to 64 and above 65 appeared to noticeably climb up. As the data for the former group had added to 0.6% from 1,334,907 to 1,339,898, the latter one had significantly increased by 4.0%, from 573,946 to 596,903.