About 570,000 households, or 11.3 percent, in Tokyo did not submit response sheets for the national census in October last year, according to the Internal Affairs and Communications Ministry. The rates in eight areas in central and western Tokyo exceeded 20 percent, casting serious doubt on the trustworthiness of the national census. The lower rates were partly because census workers could not contact a sharply increasing number of residents. The ministry also assumed it was because of people overreacting to concerns about protecting personal information. It is the basic premise of the national census that all people living in the nation are covered. The ministry is scheduled to release the failure rates in each area late this month. Ministry officials voiced concern that the sharply lower collection rates may damage the trustworthiness of data, such as population, in the national census.
According to the Tokyo metropolitan government, Chuo Ward recorded the highest failure rate at 30.3 percent among Tokyo's 23 wards and municipalities. It was followed by 29.9 percent in Machida, in western Tokyo; 25.5 percent in Shibuya Ward; 25.2 percent in Shinagawa Ward; and 23.7 percent in Shinjuku Ward. In the previous national census in 2000, no area recorded a failure rate above 20 percent and the figure for the entire Tokyo area was 5.9 percent. According to the interim results of the census released by the ministry in March, the failure rate for the nation was 4.1 percent, compared with 1.7 percent in the 2000 census. The rates in central Tokyo were remarkably high, ministry officials said.
The metropolitan government concluded that interviews by census workers have been more difficult because of the increase in condominiums with automatically locking doors, single households and working couples, as well as people's higher consciousness about crime prevention. In Chuo Ward, the number of residents in their 30s increased by more than 10,000 between 1999 and January this year. Most of the newcomers live in condominiums. Also, a remarkable number of residents refused the census due to misconceptions regarding the law protecting personal information, which was enacted in April last year. When census workers cannot collect response sheets, they are obliged to obtain basic information about households from neighbors or other sources. Though census workers are authorized to ask for the name of the head of the household, the number of persons who live there, and their gender, caretakers of condominiums or nearby residents refused to cooperate in many cases, in order to protect personal information.
In those cases, local government officials provided the missed data using information in the Basic Resident Register files. Data obtained in this way was less accurate than that obtained through census sheets as some households had failed to renew their resident registration after moving to other municipalities. Under the Statistics Law, residents of Japan must take part in the national census every five years, with the data collected exempt from the law protecting personal information. Those who refuse to respond to the census face criminal punishment--up to six months in prison or a fine of up to 100,000 yen.
The trustworthiness of the national census is extremely important for central and local governments because the information is used to decide ways of distributing tax revenue from the central government to local governments, the number of Diet members elected from each constituency, and as basic data for policy decisions. Shocked by the lower collection rates, the ministry has asked an expert panel to consider measures to reform the national census, to be drafted by the end of July.