In the following table, the overall labor-force participation rate of men has declined between 2000-2010. This overall decline reects different patterns for different age groups, however, as shown on the table. All Men Men 16-24 Men 25-54 Men 55+ 2000 80% 69% 96% 56% 2010 76 72 93 40 Which group experienced the largest decline? Given this information, what factor may have played an important role in the decline in overall male labor-force participation over this periods