The table compares the number of participants in two different age groups in marathons in a particular country from 2008 to 2012.
Overall, the number of runners in each group rose each year, and the number of joiners in the age bracket from 18 to 39 was always higher than the other.
Throughout the period, the number of people in the 18-39 age group started at 1200, then it increased gradually by 150 additional members each year, except from 2010 to 2011, when it rose by only 100 runners and ended up with 1750 members in 2012. The older age group followed a narrower trend. At the beginning of the period, this group had 800 runners and it rose consistently by 50 people in each of the three years after. At the end of the period, noticeably it had 200 more runners and this group contained 1050 joiners in total. Even though this age group had a considerable increase, the younger age group had one too. Due to that, the gap between these two was not shortened and the 18-39 age group continually stood out.
Thanks to the increase of the two groups, the total number of participants in the marathon grew dramatically each year and rose nearly half as much again as its figure. In 2008, this sport had 2000 members, then it rose by 200 runners in 2009 and 2010. In 2011, it experienced the smallest increase, exceeding only 150 members. In contrast, the joiners in 2012 had a significant growth of 250 members and ended up with 2800 members.
