Passage: The Russian governments official 2014 military budget is about 2.49 trillion rubles (approximately US$69.3 billion), the List of countries by military expenditures in the world behind the US and China. The official budget is set to rise to 3.03 trillion rubles (approximately US$83.7 billion) in 2015, and 3.36 trillion rubles (approximately US$93.9 billion) in 2016. However, unofficial estimates put the budget significantly higher, for example the Stockholm International Peace Research Institute (SIPRI) 2013 Military Expenditure Database estimated Russias military expenditure in 2012 at US$90.749 billion. This estimate is an increase of more than US$18 billion on SIPRIs estimate of the Russian military budget for 2011 (US$71.9 billion). , Russias military budget is higher than any other European nation.
How many fewer US dollars was the Russian military budget in 2014 than it was be in 2015?