-61.89% is the change from 509 to 194
Calculation steps:
[( 194 - 509 ) ÷ 509] x 100 = -61.89%
Formula
Percentage change = [(194 - 509) / 509] x 100
Subtract the new number by the original number
194 - 509 = -315
-315 ÷ 509 = -0.618860510805501
-0.618860510805501 x 100 = -61.89%