As of the start of the conservatorship, the United States Department of the Treasury had contracted to acquire US$1 billion in Freddie Mac senior preferred stock, paying at a rate of 10% per year, and the total investment may subsequently rise to as much as US$100 billion. Shares of Freddie Mac stock, however, plummeted to about one U.S. dollar on September 8, 2008, and dropped a further 50% on June 16, 2010, when the Federal Housing Finance Agency ordered the stocks delisted. In 2008, the yield on U.S Treasury securities rose in anticipation of increased U.S. federal debt. The housing market and economy eventually recovered, making Freddie Mac profitable once again.