-20.71% is the change from 647 to 513
Calculation steps:
[( 513 - 647 ) ÷ 647] x 100 = -20.71%
Formula
Percentage change = [(513 - 647) / 647] x 100
Subtract the new number by the original number
513 - 647 = -134
-134 ÷ 647 = -0.2071097372488408
-0.2071097372488408 x 100 = -20.71%