-1.31% is the change from 841 to 830
Calculation steps:
[( 830 - 841 ) ÷ 841] x 100 = -1.31%
Formula
Percentage change = [(830 - 841) / 841] x 100
Subtract the new number by the original number
830 - 841 = -11
-11 ÷ 841 = -0.013079667063020214
-0.013079667063020214 x 100 = -1.31%