-97.1% is the change from 690 to 20
Calculation steps:
[( 20 - 690 ) ÷ 690] x 100 = -97.1%
Formula
Percentage change = [(20 - 690) / 690] x 100
Subtract the new number by the original number
20 - 690 = -670
-670 ÷ 690 = -0.9710144927536232
-0.9710144927536232 x 100 = -97.1%