The provided graph depicts the statistics of three main traveler groups to a gallery throughout a period from 1997 to 2012. Overall, the number of mature visitors emerged as the most significant data while the figures for visitors aged under 15 and other special travelers were less ubiquitous, the former experienced a downward trend and the latter witnessed a slight increase.
In 1997, adult customers made up an impressive contribution to total travelers with over 300 thousand, which was twice as many as the youngster visitors and over tenth folds the number of exhibition guests. Subsequently, this amount continuously inclined to reach a peak in 2007 with approximately 400 thousand then moderately decreased by 20 thousand visitors at the end of the period.
On the other hand, the group of adolescents underwent a gradual downswing over 10 years, from 2002 to 2012, and finally ended up with around 82 thousand people visiting the museum. In the meantime, moderate growth of the remaining group could be seen consistently, having risen by nearly 15 thousand. Remarkably, although some minor fluctuations in each sector led to a visible oscillation of summarized data, which had marginally increased to 525 thousand in 2007 before dipping by 20 thousand in 2012, the rank of each type of visitor remained unchanged.