66.5% is the change from 206 to 343
Calculation steps:
[( 343 - 206 ) ÷ 206] x 100 = 66.5%
Formula
Percentage change = [(343 - 206) / 206] x 100
Subtract the new number by the original number
343 - 206 = 137
137 ÷ 206 = 0.6650485436893204
0.6650485436893204 x 100 = 66.5%