The line graph compares the change of population in three counties in the U.S. state of Oregon over a six-year period from 1940 to 2000, measured in thousands.
Overall, It is clear that Washington has a noticeably larger quantity of residents when compared to the other two counties. Meanwhile, the number of state population in Yamhill and Columbia remains quite close throughout the whole period.
In 1940, there were approximately 75,000 people in Washington, which is more than both Yamhill and Columbia combined. As can be seen from the graph, there was a significant upward trend in Washington. The county had a sharp increase in population after 1970 and ultimately peaked at around 245,000 in 2000.
On the other hand, even though Yamhill and Columbia holds a much smaller rate than Columbia, both counties grew gradually in population. While they started at a similar rate, Yamhill surpassed Columbia’s numbers in 1970. Finally, both counties reached their highest number in 2000.