The bar graph gives information about how car ownership changed in one particular country over a 30-year period from 1971 to 2001. In general, the percentage of population without a car decreased, while that of those with 1 or more than 1 car experienced an increase.
Initially, almost half of the population did not have a car in 1971. However, as more people started to buy cars, only a third of people were without a car after two decades. This figure more or less stayed unchanged by 2001.
Turning to the shares of population who had 1 or more than 1 car, their proportions increased. The former group made up a third of the population in 1971. After staying almost unchanged in the following decade, this number sharply increased and reached a peak in 1991, when almost every other person had 1 car. At the end of the period, 44% of the people had 1 car. Regarding the latter group, those with 2 or more cars accounted for smaller shares: a fifth and, after some fluctuations, 28% in 1971 and 2001, respectively.