Final answer:
According to the provided information, a significant percentage of Americans say their stress levels have stayed the same or increased over time. While the specific percentage for the last year is not mentioned, it is reasonable to assume that a substantial portion falls into this category.
Step-by-step explanation:
According to Figure 14.5, nearly half of U.S. adults indicated that their stress levels have increased over the last five years. While the specific percentage of Americans who say their stress levels have stayed the same or increased in the last year is not mentioned in the provided information, it is reasonable to assume that a significant portion of Americans would fall into this category given the overall trend of increasing stress levels over time. Additionally, Figure 14.6 shows that stress levels have generally increased across different demographic groups over a span of several decades. This suggests that a substantial percentage of Americans may indeed report that their stress levels have stayed the same or increased in the last year.