-21.61% is the change from 634 to 497
Calculation steps:
[( 497 - 634 ) ÷ 634] x 100 = -21.61%
Formula
Percentage change = [(497 - 634) / 634] x 100
Subtract the new number by the original number
497 - 634 = -137
-137 ÷ 634 = -0.21608832807570977
-0.21608832807570977 x 100 = -21.61%