-70.92% is the change from 815 to 237
Calculation steps:
[( 237 - 815 ) ÷ 815] x 100 = -70.92%
Formula
Percentage change = [(237 - 815) / 815] x 100
Subtract the new number by the original number
237 - 815 = -578
-578 ÷ 815 = -0.7092024539877301
-0.7092024539877301 x 100 = -70.92%