Which Countries Spend The Most On Their Military?

In 2015, over $1.7 trillion dollars was globally spent on defense. So which countries are the largest military spenders?

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World military spending resumes upward course, says SIPRI (sipri.org)
"World military expenditure totalled almost $1.7 trillion in 2015, an increase of 1 per cent in real terms from 2014, according to new figures from the Stockholm International Peace Research Institute (SIPRI)."

GCC military spending spree (aljazeera.com)
"Despite falling oil prices, Saudi Arabia, Qatar and the UAE are set to continue with massive military spending."

China's slowing economy leads to smallest increase in military spending in years (washingtonpost.com)
"China said Friday that its military spending will grow by 7 to 8 percent in 2016, the smallest increase in six years and a lower figure than many experts had expected, reflecting a slowing economy and a cut in troop numbers."

SIPRI Yearbook 2015: Armaments, Disarmament and International Security (sipri.org)
"A common thread in 2014 was an underlying concern about the capacity of states to manage a mounting set of often interconnected problems."