Definition: This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning). 
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
Input: Passage: In the financial year ended 31 July 2016, UCL had a total income (excluding share of joint ventures) of £1.36 billion (2014/15 - £1.26 billion) and a total expenditure of £1.23 billion (2014/15 - £1.22 billion). Key sources of income included £530.4 million from research grants and contracts (2014/15 - £427.3 million), £421.1 million from tuition fees and education contracts (2014/15 - £364.2 million), £192.1 million from funding body grants (2014/15 - £195.2 million) and £25.1 million from donations and endowments (2014/15 - £20.3 million). During the 2015/16 financial year UCL had a capital expenditure of £146.6 million (2014/15 - £149.3 million). At year end UCL had endowments of £100.9 million (31 July 2015 - £104.1 million) and total net assets of £1.19 billion (31 July 2015 - £1.07 million).

How many Euros (in billions) of their endowment did UCL use between July 2015 and July 2016?