题目：The chart shows the changes in the percentage of households with cars in a European country between 1971 and 2001. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.
The bar chart clearly illustrates the percentage of families in a European country in terms of private car ownership from 1971 to 2001. It is obvious that the ratio of households without cars declined continuously in the three decades, while families that held one or more cars saw a more vigorous growth.
To be specific, households with no cars accounted for over 51% in 1971, the highest percentage in the 30 years, and since then, the figure decreased to 41% in 1981 and 30% in 1991, followed by a drop to 28% in 2001. Compared with the proportions before 1980s, families with one car experienced a rising trend especially in the last two decades when the percentage jumped from a little over 30% in 1971 and 1981 to more than 45% in 2001. For the households that owned two or more cars, the ratio fluctuated during the 30 years from the lowest 15% in 1971 to the highest 28% in both 1981 and 2001.
Overall, most families did not have cars between 1971 and 1981, and those with only one car ranked the second place. But from 1991 to 2001, the situation reversed as a majority of households owned one car, with the highest percentage of 50% in 1991.
①in terms of: 就……而言
②vigorous: adj. 充满活力的
③account for: 占有
④reverse: v. 颠倒，翻转