The yield on the two-year notes due in July 2012 fell to a record low of 0.4547 percent last week, as investors pushed the price of the security up 2/32, or 63 cents per $1,000 face amount, to 100 8/32. The yield on the benchmark 10-year note, a 2.625 percent security due in August 2020, declined to as low as 2.53 percent, the lowest since March 2009.