The figure illustrates the relationship between duration and to_year over the observed time period. The plot shows a wide dispersion of duration values across years, with durations ranging from near zero to above 40 units. A general upward tendency can be observed, suggesting that higher duration values appear more frequently in the more recent years. However, the large number of overlapping lines creates a dense pattern, indicating substantial variability in duration across different observations. Overall, the figure highlights both the increasing tendency and the significant variability of durations over time.