-3.05% is the change from 655 to 635
Calculation steps:
[( 635 - 655 ) ÷ 655] x 100 = -3.05%
Formula
Percentage change = [(635 - 655) / 655] x 100
Subtract the new number by the original number
635 - 655 = -20
-20 ÷ 655 = -0.030534351145038167
-0.030534351145038167 x 100 = -3.05%