"人口数量40多年来一直呈下降趋势“求助这句话的英文翻译

the population has been decreasing over the past 40 years

The amount of population is always decreasing during the past 40 years.

The number of population has showed downtrend over the past 40 years.

The population size have been presenting to a downward trend in the last more than 40 years.

祝楼主愉快 ^_^

The amount of Population have been presenting a descending trend during more than 40 years.

The population has been on a decline ( downturn, downswing) for more than 40 years of the past.