-71.45% is the change from 830 to 237
Calculation steps:
[( 237 - 830 ) ÷ 830] x 100 = -71.45%
Formula
Percentage change = [(237 - 830) / 830] x 100
Subtract the new number by the original number
237 - 830 = -593
-593 ÷ 830 = -0.7144578313253012
-0.7144578313253012 x 100 = -71.45%