-39.57% is the change from 988 to 597
Calculation steps:
[( 597 - 988 ) ÷ 988] x 100 = -39.57%
Formula
Percentage change = [(597 - 988) / 988] x 100
Subtract the new number by the original number
597 - 988 = -391
-391 ÷ 988 = -0.395748987854251
-0.395748987854251 x 100 = -39.57%