The given diagram depicts the count of travel made by kids in 1990 and 2010 in one country to travel from and to school using various types of transport.
In the year 1990, walking is the most used mode of transport (around 12.5 millions per year) while car is the least used type of transport (around 4.25 millions per year). There was other types of transport used such as cycling, walking and bus and bus but, there was only a slight variations in terms of its use by the kids and all of them were in the range of 5.5-6.5 millions per year.
On the other hand, in the year 2010, car was used by most kids (around 11 millions per year) and cycling was used less which is about just 2 millions per year. The count of traveling by bus and walking during this time was almost the same where as walking and bus together was a little low comparitively.
In conclusion, the drastic change between the year 1990 to 2010 was that the people started to use car instead of walking.