The line graph compares how many people lived in three different regions in the U.S state of Oregon from 1940 to 2000.
In general, there is an increase in the population of all three counties, but the most significant change is seen in Washington. In addition, Yamhill and Columbia followed nearly similar patterns throughout the entire period. Interestingly, all three regions experienced steady rises until 1970, after which they saw sharp growths.
Turning to details, in 1940, the population of Washington was 75,000, a figure that then grew gradually to just over 120,000 in 1970, before increasing rapidly to its peak of over 240,000 in the eventual year.
As for Yamhill and Washington, they exhibited somewhat moderate increases. In the initial year, the number of people living in Yamhill stood at 30,000 in 1940, slightly higher than that of Columbia, at around 25,000. By 1970, both counties observed minor changes, accounting for 45,000 and approximately 35,000, respectively. After 1970, however, the population of Yamhill along with Columbia rose sharply, reaching 90,000 and 75,000 in 2000, respectively.