b'2017-2018 YEAR BOOKStatement of ActivitiesJune 30, 2018, and 2017(in thousands)2018 2017 67Revenue and SupportGrants and contracts $26,907$30,378 Contributions, gifts 7,6818,847 Other Income 4,2321,700 Net External Revenue 38,82040,925 Investment income and unrealized gains 95,665120,472Total Revenue $134,485$161,397ExpensesProgram and Supporting Services:Terrestrial Magnetism 9,882 9,723 Observatories 22,88620,183 Geophysical Laboratory 19,71120,587Embryology 12,764 10,912 Plant Biology 10,11811,330 Global Ecology 6,944 7,279 Other programs 849 648Administration and general expenses 13,478 21,069 Total Expenses $96,632 $101,731Change in net assets before pension related changes $ 37,853 $ 59,666 Pension related changes 1,7733,345 Net assets at the beginning of the period 1,019,197956,186 Net assets at the end of the period $ 1,058,823$ 1,019,197'