Marks longest losing streak against the dollar in nearly a month.

Marks longest losing streak against the dollar in nearly a month.

Italy, Spain and Belgium have seen borrowing costs ease.

Italy, Spain and Belgium have seen borrowing costs ease.

Amount of maturing debt is up from 2011.

Central bank's commitment to purchases is questioned.

Central bank's commitment to purchases is questioned.

U.S. currency's strong performance in May may prove fleeting.