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).. What was the third largest source of income?