This graph indicates the mutation in the share of the three most common types of commercial vehicles' registrations in the US over 40 years of period.
Overall it is evident that all three vehicles' share has fluctuated significantly. Albeit the shares have changed a lot, Truck made up the most share, following up by Taxi and then Bus hit the lowest share in 2010
Looking at the graph more specifically, generally, Truck has the most share at approximately 50 percent in 1970. But it plummeted by 30 percent which almost 2o percent point decreased in 1980. Once it hit 30 percent, it began to increase again by over 40 percent in 2010. Furthermore, Taxi has surged nearly 10 percent point in 1980 and rapid reproduction from 1980 to 2000. After that, It increases again to over 30 percent. Meanwhile, Bus, the lowest share of vehicle registrations, increased 10 percent point at the beginning. But to that end, It gradually declined even lower than 5 percent over the course of the next 30 years.
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