Here are some facts about homes in the United States and the people who live in them. In the early 1990s, about 50% of the Americans own their homes and the rest rent(租) their homes. The rented homes are usually apartments(公寓).
   74% of the people in the US make their homes in or around cities. 26% live in the country. Dogs live in about 40% of all homes in the US. About half that number have cats.
   Families in the US are becoming smaller. On the average（平均）,2.64 people lived in a home in the early 1990s. In 1960, the average was 3.5.
   Half of the teenagers in the US have their own bedrooms.
   An American moves, on the average，twelve times in his or her life. In Japan, a person moves about five times, and in England a person moves eight times.

1953年《选举法》规定：全国人大代表的选举，按照选举权计算，即8个农民等于1个工人。1982年后，工农人大代表比例改为可以小于4：1，直至1：10这种变化反映出（    ）