IELTS Grammar: find the mistakes

Find the mistakes in the following sentences. All of the sentences relate to the graph in this lesson.

1. Families who do not have cars have decreased from 1971 to 2007.
2. Households without a car percentage gradually decreased.
3. There is a rise can be noted in the proportion of households with two cars.
4. The number of household with no car were well below 50% in 1971.
5. There were least percentage of household who had three or more cars, but it steadily improved to 5% by 2007.

I'll put my answers in the comments area tomorrow.