Ministry of Health, Labour and Welfare monitors people's household income every year. They conducts a survey about people's household income. According to it, the average household income is decreasing recent years.
The following data shows the changes in household income in Japan, 2004-2013.
|Year||Household income (million yen)|
Source is Ministry of Health, Labour and Welfare. 平成26年 国民生活基礎調査の概況