-66.49% is the change from 191 to 64
Calculation steps:
[( 64 - 191 ) ÷ 191] x 100 = -66.49%
Formula
Percentage change = [(64 - 191) / 191] x 100
Subtract the new number by the original number
64 - 191 = -127
-127 ÷ 191 = -0.6649214659685864
-0.6649214659685864 x 100 = -66.49%