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By Taylor Tepper
December 16, 2015
Janet Yellen, chair of the U.S. Federal Reserve.
Janet Yellen, chair of the U.S. Federal Reserve.
Getty Images

On Wednesday, the Federal Reserve is expected to raise interest rates for the first time in nearly a decade. There’s no telling exactly how the markets will react, but if the past year in Fed announcements is any indication, investors should brace themselves for a bumpy ride ahead. Here’s what the Fed said throughout 2015, and how the markets responded.