The change of popularity in May

There is a famous pop group ‘Girls generation’. This graph shows change of their popularity in May.


To see musicvideo(http://blog.naver.com/dbalfks7812/90026774184 )X axis is date and Y axis is ranking of popularity.

Popularity of the group went up slowly in early May. Since then got worse a bit. But, directly recovered to top ranking. After mid-May, popularity went down slowly and steadily. In May 24th, the popularity dropped to forth. And after, the popularity started to recover steadily.

Popularity of Tae-yeon fluctuated all of the month, but remained the first. At first, started about 10th. But, immediately the popularity dropped about two grades. And then, increased rapidly to 7th in May 12th. And lather, the popularity decreased rapidly. After reaching 10.7th, it recovered a bit. But, in late-May, the popularity slumped again.

Tiffany is the second most popular out of group members. She was the third most popular in starting point. But her popularity increased more and more rapidly. Her popularity reached peak in May 12th. Since then her popularity declined gradually and steadily.

Yun-a is the third most popular out of group members. In early May, her popularity rose dramatically. In May 9th, her popularity reached peak. After then, her popularity got worse. In May 20th her popularity reached a low point. Since then her popularity recovered a bit rapidly, but again started to decrease in late May.

Yu-ri’s popularity had a large fluctuation. By the mid-May, her popularity fluctuated but average popularity rose gradually. Her popularity hit a high point in May 15th. Since then her popularity dropped dramatically, and reached a low point in May 24th. And then her popularity recovered quickly in short time. But her popularity dropped again in late-May.