Major events in 2015 that impacted professionals worldwide included Apple becoming the first company to hit a $700 billion valuation in February. Oil prices dipped to their lowest level since 2009, significantly affecting the global economy. 2015 saw a record $5 trillion in mergers and acquisitions deals signed, led by the healthcare and tech industries. China's economic growth slowed to 6.9% but it remained the largest driver of worldwide growth. In October, 12 countries representing 40% of global GDP signed the Trans-Pacific Partnership trade deal. The US Federal Reserve increased interest rates in December for the first time in 9 years.