-37.44% is the change from 991 to 620
Calculation steps:
[( 620 - 991 ) ÷ 991] x 100 = -37.44%
Formula
Percentage change = [(620 - 991) / 991] x 100
Subtract the new number by the original number
620 - 991 = -371
-371 ÷ 991 = -0.37436932391523714
-0.37436932391523714 x 100 = -37.44%