The bar chart below show proportion the share of vehicle registrations of the three types of commercial vehicles in the US from 1970 to 2010
Overall, both three type of vehicles have tended to decline in percentage of registration, instead of taxi from 1970 to 2010. In addition, bus registration accounted for lowest proportion in the same period time.
From 1970 to 2010, truck and bus registration fluctuated with nearly 1%. In 1970, the number of truck are registed accounting for the highest percentage among three vehicle. In contrast, bus is the least popular in that time, as well as in all period. The percentage of truck decreased sharply by nearly 18% (from about 48% to 30%) from 1970 to 1980, standing at the second of common types vehicles, and then slightly climb to 45%. The bus is only significantly rise by 10% in ten year from 1970 and then fall gradually to 4% at 2010.
The percentage of taxi registration witnessed the strong fluctuation from the given period. In ten years after 1970, this proportion peak at 36% before decrease significantly at 15% in 2000. From 2000, the percentage of taxi registration continues to fluctuate when increase by 20% to 35% and stand the second place in three vehicles.
