The line graph illustrates the shares of
registrations about truck, taxi, and bus from 1970 to 2010.
Overall, the ranking of the proportions of
the three types of vehicles was not changed between the start of the research years
and the end of it. The largest percentages made up the share of truck and bus had
the smallest percentages. In 1980, taxi had the biggest proportion among them,
but except around the year, it maintained the second largest proportion.
Looking at the graph more closely, one can
see that the proportion of truck registration decreased to 30% in 1980, but
gradually increased at the end of the research years, at around 45%. For taxi,
it had a fluctuated trend though the years. The share of registration rose to
35%, but declined until 2000 to 15%. However, in 2010, the percentage of taxi
registration returned to 35%. Lastly,
the share of bus registration at the end of the period was lower than the
beginning year in 1970.