-31.85% is the change from 945 to 644
Calculation steps:
[( 644 - 945 ) ÷ 945] x 100 = -31.85%
Formula
Percentage change = [(644 - 945) / 945] x 100
Subtract the new number by the original number
644 - 945 = -301
-301 ÷ 945 = -0.31851851851851853
-0.31851851851851853 x 100 = -31.85%