The 25 Largest Oklahoma Companies Total Audited Operating Income Improvement in the Three Most Recent Years Was $52.3 Bil, With 73% of it Occurring in 2016, Obama's Last Year in Office

Since Oklahoma is one of the 12 Super Tuesday US States Holding Their 2020 Democratic Presidential Early Primary on March 3, 2020, I Think It Might Be Helpful to Research Just How Oklahoma Companies Have Performed on the Audited Operating Earnings Front in the Most Recent Three Years
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In 2016, the Total Annual Audited Operating Income Improvement Over 2015 was $38.2 Bil For These 25 Largest Oklahoma Cos

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In 2017, the Total Annual Audited Operating Income Improvement Over 2016 was a Much Lower $11.2 Bil For These 25 Largest Oklahoma Cos

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And in 2018, the Total Annual Audited Operating Income Improvement Over 2017 was an Even Much Lower $2.9 Bil For These 25 Largest Oklahoma Cos

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From a review of SEC filings, I found 25 Oklahoma Companies with stock markets caps of above $1 Bil sometime in 2018.

  

From a review of SEC filings, the chart below shows the Audited Gold-Standard US GAAP Pretax Operating Income (Loss) From Continuing Operations for the Fiscal Years Ended (FYE) 2018, 2017, 2016 and 2015 for each of these 25 Largest Oklahoma Companies.  Devon Energy's Operating Income below is its Pretax Income (Loss) excluding Finance Costs-Net since its Operating Income wasn't disclosed.  Oklahoma Financial Cos Operating Income and Pretax Income are the same. 

			Most
			Recent	Audited	Audited	Audited	Audited
			Annual	Operating	Operating	Operating	Operating
			Audited	Income	Income	Income	Income
	Oklahoma		Financial	(Loss)	(Loss)	(Loss)	(Loss)
Oklahoma Companies	City	State	Sts	FYE	FYE	FYE	FYE
Stock Market Caps > $ Bil	HQs	HQs	FYE	2018	2017	2016	2015
				$ mils	$ mils	$ mils	$ mils
ONEOK	Tulsa	OK	Dec 18	1,835	1,392	1,296	996
Continental Resources	Oklahoma City	OK	Dec 18	1,594	449	(288)	(224)
Devon Energy	Oklahoma City	OK	Dec 18	1,514	1,090	284	(19,339)
Magellan Midstream Partners LP	Tulsa	OK	Dec 18	1,195	1,053	937	967
Chesapeake Energy	Oklahoma City	OK	Dec 18	882	1,139	(4,411)	(18,919)
Williams Companies	Tulsa	OK	Dec 18	768	927	689	226
Enable Midstream Partners LP	Oklahoma City	OK	Dec 18	648	528	385	(712)
BOK Financial	Tulsa	OK	Dec 18	565	518	339	432
WPX Energy	Tulsa	OK	Dec 18	554	98	(826)	274
OGE Energy	Oklahoma City	OK	Dec 18	490	532	531	507
Mammoth Energy Services	Oklahoma City	OK	Dec 18	394	63	(35)	(16)
Gulfport Energy	Oklahoma City	OK	Dec 18	392	548	(868)	(1,335)
Alliance Resource Partners LP	Tulsa	OK	Dec 18	372	332	368	361
Laredo Petroleum	Tulsa	OK	Dec 18	348	250	(88)	(2,472)
ONE Gas	Tulsa	OK	Dec 18	288	317	289	265
Roan Resources	Oklahoma City	OK	Dec 18	225	20	7	0
Paycom Software	Oklahoma City	OK	Dec 18	174	130	102	34
BancFirst Corp	Oklahoma City	OK	Dec 18	160	136	108	101
Semgroup	Tulsa	OK	Dec 18	156	94	121	129
NGL Energy Partners LP	Tulsa	OK	Mar 18	138	255	(105)	107
Sonic Corp	Oklahoma City	OK	Aug 18	106	123	127	116
AAON Inc	Tulsa	OK	Dec 18	56	74	80	71
Helmerich & Payne	Tulsa	OK	Sep 18	32	(173)	(26)	672
Ring Energy	Tulsa	OK	Dec 18	20	16	(57)	(13)
Unit Corp	Tulsa	OK	Dec 18	(17)	84	(144)	(1,659)
Total all 25 Oklahoma Cos				12,889	9,995	(1,185)	(39,431)
Total Annual Operating Income Improvement From Prior Year				2,894	11,180	38,246