The line graph demonstrates number of people join in including basketball, tennis, badminton and rugby from 1985 to 2005.
Around 20 years starting at 1985, out of four types of sport rugby fell sharply and contrast with rugby, tennis was raised up. During this period, basketball and badminton were plateau.
Started at 1985 ,rugby were had nearly 250 players, at the same time while tennis only had 150 joins. Pass 15 years, two types of sport were had the same data when it is had 200 players but rugby minus 50 join while tennis plus 50 join. 50 players whose join into rugby between 1995 and 2005, this sport were plummeted. Although rugby decreased very fast, but tennis increased maintain over this period.
In 20 years, the unit of participant basketball and badminton don’t have unequal about players. fluctuation in join number approximate 10 to 20 people over 20 years.