To determine the value of \( x \) that represents the year 2020, we need to calculate the number of years after 1950 that corresponds to 2020.
The formula to find \( x \) is:
\[ x = \text{year} - 1950 \]
So for the year 2020:
\[ x = 2020 - 1950 = 70 \]
Thus, the value of \( x \) that represents 2020 is \( \boxed{70} \).