-61.04% is the change from 670 to 261
Calculation steps:
[( 261 - 670 ) ÷ 670] x 100 = -61.04%
Formula
Percentage change = [(261 - 670) / 670] x 100
Subtract the new number by the original number
261 - 670 = -409
-409 ÷ 670 = -0.6104477611940299
-0.6104477611940299 x 100 = -61.04%