After falling to an all-time low Wednesday, the 30-year U.S. Treasury bond yield TMUBMUSD30Y, 1.403% dropped under the 2% level for the first time early Thursday in Asian trading. The longest-dated Treasury bond dropped to 2.06% during U.S. trading, and was last at 1.97%. The 30-year yield's previous all-time low was set in July 2016, when it touched 2.09% after the U.K.'s Brexit vote. Debt prices move in the opposite direction of yields.