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The line graph illustrates the change of vehicle registrations in US of truck, taxies, and buses from 1970 to 2010. Overall, it is clear that all three types of vehicles fluctuated considerably, with trucks accounting for the largest percentage, followed by taxies and buses over the 40 year period. Looking at the graph more closely, one can see that at first, the truck had the highest proportion than others, until plunged by roughly 30 percent during 10 years. Wheras the percentage of US bus registration increased slowly to about 45 percent, equaled to it's highest point, over the 30 year period. In contrast, the proportion of registrations of the taxi grew almost 35 percent, with surpassing the truck's. However, it decreased slowly from 1980 to 2000, with hitting a low of approximately 15 percent, and it expanded to about 35 percent again from 2000 to the ends of period. Meanwhile, the proportion of registration of US's buses rised to almost 15 percent during first 10 years, but declined slowly, with reaching the lowest point in almost 5 percent from 1980 to 2010.
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