-60.05% is the change from 851 to 340
Calculation steps:
[( 340 - 851 ) ÷ 851] x 100 = -60.05%
Formula
Percentage change = [(340 - 851) / 851] x 100
Subtract the new number by the original number
340 - 851 = -511
-511 ÷ 851 = -0.600470035252644
-0.600470035252644 x 100 = -60.05%