Financial Highlights

Year ended or at December 31
Income Statement Data
(in millions, except per share data and notional value)	2015	2014	Change
¹Amounts exclude cash performance bonds and guaranty fund contributions. ²2011 results include a $646 million non-cash benefit from a tax adjustment primarily due to a revaluation of our deferred tax liabilities. All references to volume, open interest and notional value in the text of this document exclude our CDS and IRS contracts. See the 2015 Annual Report on Form 10-K for the company's forward-looking statements and risk factors.
Total revenues	$3,327	$3,113	7%
Operating income	1,989	1,768	12
Income before income taxes	1,957	1,771	10
Net income attributable to CME Group	1,247	1,127	11
Earnings per share:
Basic	$3.71	$3.37	10%
Diluted	3.69	3.35	10
Balance Sheet Data
Current assets¹	$2,351	$1,979	19%
Total assets¹	31,818	31,675	-
Current liabilities¹	1,271	964	32
Total liabilities¹	11,267	10,751	5
CME Group shareholders' equity	20,552	20,923	(2)
Other Data
Total contract volume (round turn trades)	3,533	3,443	3%
Total electronic volume (round turn trades)	3,083	2,975	4
Open interest at year end (contracts)	91	94	(2)
Notional value of trading volume (in trillions)	$1,167	$1,161	-