The given two line charts give information about the per capita consumption of butter and margarine in the United States during the 40-year period, starting in 1980.
It is clear that two categories witnessed contrasting trends. While the figure for margarine significantly declined, that for butter dipped initially but then rose steadily for the rest of the period.
Looking first at the margarine consumption, in 1980, approximately 10.4 pounds were consumed, which was nearly double the consumption of butter. After which, margarine plummeted consistently to about 6 pounds in the middle of the period and finished at only 2 pounds in 2020. Notably, it converged with butter at roughly 4.8 pounds in 2005 before hitting the lowest point.
Turning to the consumption of butter, it showed a more fluctuated pattern. Beginning at roughly 4.8, this ingredient subsequently decreased to around 4 after 10 years, before recovering to the initial rate in 2000. Finally, it continued to rise to a lesser extent to surpass the consumption of margarine and reached nearly 6 pounds in 2020, which was three times higher than margarine.