Context: It is estimated that 5.5 million tonnes of uranium exists in ore reserves that are economically viable at US$59 per lb of uranium, while 35 million tonnes are classed as mineral resources (reasonable prospects for eventual economic extraction). Prices went from about $10/lb in May 2003 to $138/lb in July 2007. This has caused a big increase in spending on exploration, with US$200 million being spent worldwide in 2005, a 54% increase on the previous year. This trend continued through 2006, when expenditure on exploration rocketed to over $774 million, an increase of over 250% compared to 2004. The OECD Nuclear Energy Agency said exploration figures for 2007 would likely match those for 2006.

Question: How much economically viable uranium is there in ore reserves, in millions of tonnes?
Answer: 5.5

Question: How many millions of tonnes are uranium are regarded as mineral resources?
Answer: 35

Question: What was the price of uranium per pound as of May 2003?
Answer: $10

Question: In 2005, how much money was spent on uranium exploration?
Answer: US$200 million

Question: How much money was spent to explore for uranium in 2006?
Answer: $774 million

Question: How much economically viable uranium is there in ore reserves, in billions of tonnes?
Answer: Unanswerable

Question: How many billions of tonnes are uranium are regarded as mineral resources?
Answer: Unanswerable

Question: What was the price of uranium per kilo as of May 2003?
Answer: Unanswerable

Question: In 2015, how much money was spent on uranium exploration?
Answer: Unanswerable

Question: How much money was spent to explore for uranium in 2016?
Answer: Unanswerable