as on 31.12.2011 as on 30.09.2011 as on 30.06.2011 as on 31.03.2011 as on 31.12.2010 as on 30.09.2010 as on 30.06.2010 as on 31.03.2010 as on 31.12.2009 as on 30.09.2009 as on 30.06.2009 as on 31.03.2009
as on 31.12.2011
as on 30.09.2011
as on 30.06.2011
as on 31.03.2011
as on 31.12.2010
as on 30.09.2010
as on 30.06.2010
as on 31.03.2010
as on 31.12.2009
as on 30.09.2009
as on 30.06.2009
as on 31.03.2009