The line graph illustrates how the residents of 3 counties namely Columbia, Yamhill and Washington state changed over a 60-year period, measured by thousands.
Overall, it can be seen that the population of Washington was highest throughout the period while the figure for both counties Columbia and Yamihi had the same increasing trend but Yamhill was still modestly higher at the end of the period.
In 1940, the inhabitants in Washington were approximately 75,000 people . After that, it witnessed a dramatically went up by over 125,000 people in 1970. Moreover, in 2000 the number rocketed to reach a peak of 245,000 people
Columbia and Yamhill followed a similar pattern, with Yamhill slightly surpassing in numbers, starting at 27,000 and 30,000 in 1940 respectively, the population in both counties gradually climbed until 1970, then rose dramatically to finish the whole period with 35,000 people for Columbia and 45,000 people for Yamhill
