-19.79% is the change from 773 to 620
Calculation steps:
[( 620 - 773 ) ÷ 773] x 100 = -19.79%
Formula
Percentage change = [(620 - 773) / 773] x 100
Subtract the new number by the original number
620 - 773 = -153
-153 ÷ 773 = -0.1979301423027167
-0.1979301423027167 x 100 = -19.79%