Exhibit 99.1

Name and Address of Additional Reporting Persons:

The principal business address for each member of the Slim Family is:

Paseo de Las Palmas #736

Colonia Lomas de Chapultepec

11000 Ciudad de México, México

Explanation of Responses:

Beneficial Ownership of Inversora

As of the date of this filing, (i) Inversora Carso owns 17,556,343 shares of Class A Common Stock, $0.001 par value per share (the “Class A Common Shares”), which are held by Control Empresarial de Capitales S.A. de C.V., a wholly-owned subsidiary of Inversora Carso, and (ii) the Slim Family, which are beneficiaries of a Mexican trust that in turn owns all of the issued and outstanding voting equity securities of Inversora Carso, may be deemed to beneficially own indirectly the Class A Common Shares beneficially owned by Inversora Carso. The Class A Common Shares beneficially owned by Inversora Carso constitute approximately 14.6% of the 119,843,868 issued and outstanding Class A Common Shares, as reported in the Form 10-Q filed by the Issuer with the SEC on October 31, 2019. As a result, the Slim Family may also be deemed to beneficially own approximately 14.6% of the 119,843,868 issued and outstanding Class A Common Shares, as reported in the Form 10-Q filed by the Issuer with the SEC on October 31, 2019.

	Signature Page
Carlos Slim Helú
Carlos Slim Domit	By:		/s/ Javier Foncerrada
		Javier Foncerrada
Marco Antonio Slim Domit		Attorney-in-Fact*
		November 12, 2019
Patrick Slim Domit
María Soumaya Slim Domit
Vanessa Paola Slim Domit
Johanna Monique Slim Domit
INVERSORA CARSO, S.A. DE C.V.
By: Armando Ibáñez Vázquez
Title: Attorney-in-Fact

* See the Powers of Attorney for the members of the Slim Family and Inversora, which are filed as exhibits to the Form 4 filed by the Slim Family and Inversora Carso with the SEC on February 12, 2018 in connection with their sale of Class A Common Shares, par value $0.10 per share of The New York Times Company, and the Joint Filing Agreement among the Slim Family and Inversora Carso, filed by the Slim Family and Inversora Carso with the SEC on August 30, 2017 as an exhibit to the initial Schedule 13G in respect of their ownership of the Issuer, are hereby incorporated herein by reference.