The yield fell 7 basis points to 3.61 percent , the lowest since March 12 and within 7 basis points of a 45-year low .
The yield fell 7 basis points to 3.61 percent , the lowest since March 12 and within 7 basis points of a 45-year low .
The yield fell 2 basis points to 1.41 percent , after reaching 1.4 percent on May 8 , the lowest since March 12 .