-22.59% is the change from 642 to 497
Calculation steps:
[( 497 - 642 ) ÷ 642] x 100 = -22.59%
Formula
Percentage change = [(497 - 642) / 642] x 100
Subtract the new number by the original number
497 - 642 = -145
-145 ÷ 642 = -0.22585669781931464
-0.22585669781931464 x 100 = -22.59%