The provided table depicts the demographic density of New Zealand by age category in two year, from 2011 to 2012. Overall, the total amount of the demographic underwent an upward trend. Additionally,, although the group of people under 39 years old witnessed a slight dip, whereas the number of over-40-year-old people moderately rose an opposite pattern.
In 2011, the data of individuals between 15 and 39 years old is the most major in population, followed by the group of 40-64, which were over 1,577 thousand and 1,330 thousand, respectively. In the meantime, the number of young New Zealanders under 15 ranked third with nearly 900 thousand people, and the smallest segment belonged to the seniors 65+, recording slightly over 570 thousand.
In 2012, noticeably, the elderly group over 65 years old witnessed the most rapid increase of 4% to about less than 600 thousand this year. At the same time, the number of adults aged 40-64 rose by 0.6% to nearly 1,340 hundred. Conversely, both groups from 15 to 39 and under 15 insignificantly declined by 0.2%. Although all categories came with minor fluctuations, the overall demographic ranks of each category remained unchanged.