ARASHI's fanclub officially has 1 million members in its rooster
Arashi’s fanclub through the years:
Established in April 2001
April 2002 90,000 members
April 2003 110,000 members
April 2004 120,000 members
April 2005 130,000 members
April 2006 150,000 members
April 2007 190,000 members
April 2008 250,000 members
April 2009 400,000 members
April 2010 670,000 members
April 2011 980,000 members
May 2011 1,000,000 members.
http://arashi-on.livejournal.com/3872009.html