How popular is
'What A Friend We Have In Jesus'
in Japan?

• Marriages:
  In 2002, there were 757,331 marriages in Japan.

  Source: Summary of Vital Statistics (June 5, 2003), Statistics and Information Department, Minister's Secretariat, Ministry of Health, Labour and Welfare, 1-2-2 Kasumigaseki, Chiyoda-ku, Tokyo 100-8916
• Wedding ceremonies:
  In 2002, there were 461,972 western style weddings in Japan.

  Assuming 61.2% of weddings are western style, based on survey by Zexy on 4,132 couples who married in 2001 and responded to the poll. (20.1% had Shinto-style weddings, 0.9% married at Buddhist temples, and 16% had no religious ceremony.)
• What a Friend We Have In Jesus:
  This hymn was sung at 74.51% of these weddings, that is, 344,215 weddings.

  Based on survey of 51 hotels and bridal halls in Japan in 2003.
• Congregation:
  Average 76.96 guests per wedding ceremony.

  Based on survey of 51 hotels and bridal halls in Japan in 2003.
• so...
  344,215 x 67.96 = 23,392,870 (20% of Japan's population) sing this song every year.

  which nicely supports the notion that you can find some pretty useless information on the internet