A breakdown of population rate in three different areas of Oregon from 1940 to 2000 is shown in line chart. Overall, more people lived in Washington. Therefore, population rate had a similar trend for all countries.
Initially, the number of population rose during the 60 years and reached the maximum level in 2000, but Washington's population always came first among other countries. There was a significant gap in Washington compared to Yamhill and Columbia in 1940 with a gap of approximately twice as much and it had widened to over 160,000 in 2000 due to significant increase in the number of people in Washington.
At more detailed look at the graph reveals that the difference was less marked 1940, with just over 25,000 and 30,000 people live in Columbia and Yamhill respectively, while population in Washington was in number 75,000. Additionally, for the next 30 years, experienced slightly increase in the number of population in three areas. By 2000, a significant growth in Washington's population reached a peak at over 240,000, while the others had fairly similar population with Washington at the beginning of the period.