The given chart illustrates how the proportion of domestic cars varies in one European country from 1971 to 2001.
Overall, there was an upward trend in the number of all groups except for the figures for the household without a car. In addition, the number of families having one car surpassed those without a car to become the largest portion by the end of the survey.
In 1971, the percentage of households having no car was the highest at nearly half of families in the country. The number for this group went down gradually and touched the lowest point at 30% in 1991, before staying stable for the last 10 years.
Regarding the two remaining groups, about 35% of households in the country have one car, which was double the percentage for those who had two cars in 1971. The proportion for the former then decreased considerably to the bottom at nearly 20% in 1991, before rocketing to the highest point at about 42% in the last year. Meanwhile, there was a wild fluctuation in the number of households having one car previously to end at approximately 30% in 2001.