Нарыл пачку мануалов:
1st Edition, July 1999 (5EA-28199-E2) - нет инфы (но если посчитать "Secondary reduction ratio" 2,235 то получим ~17/38)
1st Edition, July 2000 (5EA-28199-E3) - 17/38
1st edition, July 2001 (5EA-28199-E4) - 18/39
1st edition, July 2002 (5WM-28199-E0) - 18/39
1st edition, September 2003 (5WM-28199-E1) - 39/18
1st edition, July 2004 (5WM-28199-E2) - 39/18
1st edition, July 2005 (5WM-28199-E3) - 39/18
1st edition, November 2006 (5WM-28199-E4) - 38/17
1st edition, November 2007 (5WM-28199-E5) - 38/17
1st edition, July 2008 (5WM-28199-E6) - 38/17
1st edition, October 2009 (5WM-28199-E7) - 38/17