-13.45% is the change from 959 to 830
Calculation steps:
[( 830 - 959 ) ÷ 959] x 100 = -13.45%
Formula
Percentage change = [(830 - 959) / 959] x 100
Subtract the new number by the original number
830 - 959 = -129
-129 ÷ 959 = -0.13451511991657977
-0.13451511991657977 x 100 = -13.45%