The line graph below illustrates the change in population over the course of 60 years in three different counties (Columbia, Yamhill, and Washington) in the US state of Oregon, the population given is with respect to thousands.
Overall, from the graph we can analyze that the population of Columbia rose dramatically, whereas in Yamhill the population grew steadily over the years, in Washington the population followed the same trend of Yamhill.
In 1940 the population in Washington was 75000, which followed a steady pattern of increase and over the next 30 years (1970) to reach the population of 125000, which over a period of times increased dramatically to 245000 which was the highest among the 3 counties in the US state of Oregon.
From the year 1940 to 2000 if we compare the population pattern of Yamhill and Columbia. We can depict that in 1940 the population in the two counties was 28000 Columbia and 30000 in Yamhill, which followed the same pattern of growth up to 1970 and population in Columbia and Yamhill was recorded to be 35000 and 45000 respectively, The population in 2000 in two counties Columbia and Yamhill rose to 75000 and 90000 respectively.