This table illustrates the past and estimated population trend in several countries from the year 1990 to 2050. Overall, all countries present an increasing trend in population over the period of time.
According to the table, the United States has been the country with the largest population since 1990, with a population of 249.9 million and it is estimated to have 349.0 million in 2050. In contrast, New Zealand, which has been the country with lowest population, only presents single digits in population throughout the time period. The population of the United States has been around 70-fold of that of New Zealand. The remaining two countries, Australia and Canada, are estimated to have 26.0 and 39.0 million people in 2050, respectively.
As mentioned, all four countries show an upward trend in population. Compare the estimated population in 2050 to the population in 1990, New Zealand, the United States, and Canada has an increase in population by 38.2%, 39.7%, and 46.6%, respectively. Noticeably, Australia presented the largest population growth, increasing by 52.0%.
All in all, the population of these four countries has been increasing as time goes by, and population growth is estimated to be a common phenomenon worldwide in the future.