The graph illustrates the percentage of the population that engaged in volunteering activities in the United States from 2002 to 2015. Overall, there was a fluctuating trend in volunteerism during this period. In 2002, approximately 27% of the population participated in volunteering, which experienced a slight decline to around 26% in 2004. However, there was a significant increase in volunteerism from 2004 to 2005, reaching its peak at nearly 29%. From 2005 to 2008, the percentage of volunteers remained relatively stable, fluctuating between 28% and 29%. Subsequently, there was a gradual decline in volunteerism, with the percentage dropping to around 25% in 2011. Between 2011 and 2015, the trend showed a slight recovery, with the percentage of volunteers increasing to approximately 26%. In summary, the graph demonstrates that volunteerism in the United States experienced fluctuations over the examined period. The highest percentage of volunteers was recorded in 2005, while the lowest was observed in 2011. Despite some variations, the overall trend remained relatively stable, with the percentage of volunteers ranging between 25% and 29%.