-98.67% is the change from 977 to 13
Calculation steps:
[( 13 - 977 ) ÷ 977] x 100 = -98.67%
Formula
Percentage change = [(13 - 977) / 977] x 100
Subtract the new number by the original number
13 - 977 = -964
-964 ÷ 977 = -0.9866939611054247
-0.9866939611054247 x 100 = -98.67%