The line graph mentioned in the question describes the data of participants for the five activities at a social center in Melbourne, Australia for 20 years of time.
Overall, the number of participants in table tennis and musical performance increased. There was a decline in the number of participants taking part in amateur dramatics, whereas the number is static in film club and martial arts.
In 2000, only around 15 people participated in table tennis. The number remained static till 2010. After that, the number rose sharply to reach almost 55 in 2020. Though musical performance was introduced five years later in 2005, the number of people participating in this activity rose sharply from 0 to almost 15, and then gradually reached around 20.
People participating in amateur dramatics was around 25 in 2000, which rose to almost 30 in 2005. After that, the number gradually decreased to around 5 in 2020. Initially, people participating in martial arts were around 35, which then after two subsequent declines and inclines again reached the same number as before. The number of participants film club was around 65 at first, which was the highest among all activities. Then after a gradual decrease, the number reached around 60; which again gradually rose to around 65.