-95.77% is the change from 497 to 21
Calculation steps:
[( 21 - 497 ) ÷ 497] x 100 = -95.77%
Formula
Percentage change = [(21 - 497) / 497] x 100
Subtract the new number by the original number
21 - 497 = -476
-476 ÷ 497 = -0.9577464788732394
-0.9577464788732394 x 100 = -95.77%