To find the percentage difference between two numbers, we first need to calculate the absolute difference between them. In this case, the absolute difference between 205 and 189 is 16.

Next, we need to find the average of the two numbers. The average of 205 and 189 is (205+189)/2 = 197.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 205 and 189 is (16/197) x 100 = 8.12%.

This means that the value of 205 is 8.12% greater than the value of 189. Alternatively, we can say that the value of 189 is 8.12% less than the value of 205.