-21.48% is the change from 661 to 519
Calculation steps:
[( 519 - 661 ) ÷ 661] x 100 = -21.48%
Formula
Percentage change = [(519 - 661) / 661] x 100
Subtract the new number by the original number
519 - 661 = -142
-142 ÷ 661 = -0.21482602118003025
-0.21482602118003025 x 100 = -21.48%