The line graph shows the number of population in three different countries in the United States of Oregon; Columbia, Yamhill and Washington during 6 decades, between 1940 and 2000, and it measures in thousands. It is clear that the population in three countries show a significant increase during the period.
The introduction is too bulky.
Why don't you start writing this: The line graph shows a large portion of the population living in Columbia, Yamhill and Washington,...
The number of population in Columbia recorded the lowest in the state of Oregon
Columbia had a population of (write the figure number here, a number in the thousands). This was the lowest growth in fixed period.
similar patterns which were a significant upward.
similar significant upward patterns.
the number of Washington people inclined sharply
A period of rapid population growth in Washington