Can I follow the dollar rate with windchill?

Hi,

When Turkish lira is entered in Windhill, I created an attribute that multiplies this value with this year's dollar rate.

However, the dollar rate is fixed at a different value each year. For example;

In 2021 I need to multiply this value by 11, in 2022 I need to multiply it by 17.64.

How do you think I can overcome this situation? yes, I may not be able to establish a dynamic structure, but do you think I should create a new attribute every year?

Note: attribute directly affects a form and its values ​​should not change. For this reason, it is impossible for me to regularly update the calculated attribute.