2015 Volume 68 Issue 1 Pages 80
Volume 67, no. 6, p.447–457, 2014. Page 448, Figure 1 should appear as shown below.
Page 449, ``log4 or 0.6 log10'' in the 9th line in the left column should read ``1.6 log10,'' and (``http://www.japan-now.com/article/343318758.html [in Japanese]'') in the 10-11th lines should read (``http://ecitizen.jp/Ssds/Indicators/_A01202 [in Japanese]).''