The graph depicts an aircraft (Wright Brother Airways) seats proportion in percentages that can be filled in four difference classes in three years time point (2005,2010, and 2015).
Overall, it is clear that premium economy class dominated the data in last two periods, while economy and first class had a same pattern but with different numbers, and the last for business that only showed a high number at the first.
Looking firstly at premium economy, this group experienced a substantial increased in this category, starting from 85% to 95%, which the largest bar in the picture. Subsequently, economy and first class had a same trend at the first until 2010 (steady in 80%), but suddenly the former inclined by one-tenth, while the latter only one-fifth.
Moving to the business class, it recorded the highest percentages in the initial period (90%). Following by next year, it dropped dramatically by 25%, which the lowest number in the graph. Finally, it growth by 10%, but it still the smallest data last period.
