Question: What is the annual revenue of American gaming corporation who owned Harrah's Ak-Chin Casino?

Context paragraphs:
Caesars Entertainment Corporation: Caesars Entertainment Corporation, is an American gaming corporation based in Paradise, Nevada that owns and operates over 50 casinos and hotels, and seven golf courses under several brands.  It is the fourth-largest gaming company in the world, with annual revenues of $8.6 billion (2013).  Caesars is a public company, majority-owned by a group of private equity firms led by Apollo Global Management and TPG Capital.

Boyd Gaming: Boyd Gaming Corporation is an American gaming and hospitality company based in Paradise, Nevada.  The company continues to be run by founder Sam Boyd's family under the management of Sam's son, Bill Boyd (born 1931), who currently serves as the company's executive chairman after retiring as CEO in January 2008.

Casino Rama: Casino Rama is a large casino, hotel and entertainment complex located on the reserve land of Chippewas of Rama First Nation, in the town of Rama, Ontario, Canada.  A joint venture between First Nations, commercial operators Penn National Gaming, and the Ontario Lottery and Gaming Corporation, it is Ontario's only First Nations "commercial casino" (as opposed to a lesser class, Charity casino) and the largest First Nations casino in Canada.  The casino is operated by Wyomissing, Pennsylvania-based Penn National Gaming of the United States.  The entertainment complex regularly hosts ticketed entertainment shows for an additional charge.

Seneca Buffalo Creek Casino: Seneca Buffalo Creek Casino is a casino in Buffalo, New York.  It is owned by the Seneca Nation of New York, through the Seneca Gaming Corporation.  The complex consists of 67000 sqft of gaming space.  It opened as a temporary structure in 2007 and a permanent casino building opened in August 2013.  A much larger and more expensive investment had previously been planned, prior to the Great Recession.  The casino attracts about 3 million visitors annually.

Impact of Native American gaming: Impacts of Native American gaming can be positive or negative, depending on the tribe and its location.  In the 1970s, various Native American tribes took unprecedented action to initiate Native gaming enterprises.  In doing so, they created not only a series of legal struggles between the federal, state, and tribal governments but also a groundbreaking way to revitalize the Native American economy.  Native American gaming has grown from bingo parlors to high-stakes gaming and is surrounded by controversy on many different levels.  There are disputes concerning tribal sovereignty, negative effects of gaming, and a loss of Native American culture.  In the United States the Indian Gaming Regulatory Act was passed in 1988 in order to secure collaboration between the states and tribes and also in order for the federal government to oversee gaming operations.  Native American gaming has proven to be extremely lucrative for several tribes, but it has also been unsuccessful in some instances.  Native American gaming is contingent upon and only beneficial to its respective reservation.

Harrah's Ak-Chin Casino: Harrah's Ak-Chin is a hotel and casino located 39 miles (63 km) south of Phoenix, Arizona in Maricopa.  It is owned by the Ak-Chin Indian Community and operated by Caesars Entertainment Corporation.  The 40,000-square-foot (3,700 m2) casino has video poker and slot machines, as well as blackjack, keno and bingo and has a 24-7 operation.

Paycom: Paycom Software, Inc., known simply as Paycom, is an American online payroll and human resource technology provider based in Oklahoma City, Oklahoma.  It is attributed with being one of the first fully online payroll providers and has offices throughout the U.S.  It has also been recognized by "Inc." magazine as one of the fastest-growing private companies in the U.S. based on annual revenue growth.  Founded in 1998, it reported annual revenue of $329.1 million for 2016, up from $224.70 million for 2015 and 150.929 million in 2014.

Sask Gaming: Saskatchewan Gaming Corporation (commonly referred to as Sask Gaming) is a Crown corporation owned by the Government of Saskatchewan established in 1996 to set up and operate the Casino Regina.  In 2002, Sask Gaming opened Casino Moose Jaw.  Sask Gaming is regulated by the Saskatchewan Liquor and Gaming Authority.

Native American gaming: Native American gaming comprises casinos, bingo halls, and other gambling operations on Indian reservations or other tribal land in the United States.  Because these areas have tribal sovereignty, states have limited ability to forbid gambling there, as codified by the Indian Gaming Regulatory Act of 1988.  As of 2011, there were 460 gambling operations run by 240 tribes, with a total annual revenue of $27 billion.

Laughlin (Nevada gaming area): The American Gaming Association lists Laughlin as #17 out of the top 20 US Casino Markets by annual revenue, right behind Downtown.  The Nevada Gaming Commission revenue as listed in the annual gaming abstract for fiscal year 2008 (1 July 2007 through 31 June 2008).  Equivalent figures for Downtown are shown for comparison.  Licenses in Laughlin are only reported in one group.  All casinos make more than $1,000,000 in gaming revenue annually.

Supporting paragraphs: Harrah's Ak-Chin Casino Caesars Entertainment Corporation
Answer: $8.6 billion (2013)