According to data released last week by Freddie Mac, we're seeing some of the lowest mortgage rates in three years.In their report on April 14, the 30-year fixed-rate average dropped to 3.58 percent while the 15-year fixed-rate average fell to 2.86 percent. It was 2.88 percent the week before and 2.94 percent last year. The last time the 15-year fixed rate fell this far down was also in May 2013.The five-year adjustable rate average slipped to 2.84 percent when it was 2.82 percent the week before and 2.88 percent a year ago.Things have since changed with their latest data released on Thursday. The 30-year fixed-rate is up just slightly to 3.59 percent and not surprisingly, the 15-year fixed-rate dropped again to 2.85 percent.The Washington Post had a great article last week about what these rates mean. As they stated, the mortgage rate drop was "pushed down by jitters over the global economy and oil prices.Earlier [last] week, the International Monetary Fund became the latest organization to express concern about the global economy, joining the Federal Reserve and the European Central Bank. These worries have led many observers to predict that home loan rates will remain low for the near term."Make sure you read the full article from The Washington Post and stay tuned to see where else our mortgage rates may be headed.