-16.61% is the change from 644 to 537
Calculation steps:
[( 537 - 644 ) ÷ 644] x 100 = -16.61%
Formula
Percentage change = [(537 - 644) / 644] x 100
Subtract the new number by the original number
537 - 644 = -107
-107 ÷ 644 = -0.16614906832298137
-0.16614906832298137 x 100 = -16.61%