-77.38% is the change from 977 to 221
Calculation steps:
[( 221 - 977 ) ÷ 977] x 100 = -77.38%
Formula
Percentage change = [(221 - 977) / 977] x 100
Subtract the new number by the original number
221 - 977 = -756
-756 ÷ 977 = -0.7737973387922211
-0.7737973387922211 x 100 = -77.38%