noun
rate of change
Used in technical, economic, or statistical contexts to express the percentage or ratio by which something increases or decreases.
先月の売上増減率はプラス5%だった。
The rate of change in sales last month was plus 5%.
人口の増減率をグラフで示してください。
Please show the rate of population change on a graph.
減少率 specifically refers to the rate of decrease, while 増減率 covers both directions.
Compound of 増減 (increase and decrease) + 率 (rate).