2018年5月的汽车生产，销售和出口业绩
https://newsroom.toyota.co.jp/en/corporate/23214193.html
Nissan production, sales and export results for May 2018 – Global Newsroom
https://newsroom.nissan-global.com/releases/180628-01-e?lang=en-US&rss
MAZDA: Mazda Production and Sales Results for May 2018 (Flash Report) | News Releases
http://www2.mazda.com/en/publicity/release/2018/201806/180628a.html
Japanese Automakers’ Domestic Production Up for 4th Month – JIJI PRESS