EXHIBIT A

JOINT FILING AGREEMENT

The undersigned hereby agree that the Statement on Schedule 13G filed herewith is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(k)(1)(iii) promulgated pursuant to the Securities Exchange Act of 1934, as amended, on behalf of each such person.

Date: June 17, 2010	ABU DHABI INVESTMENT AUTHORITY
	/s/ HAREB AL DARMAKI
	By:	Hareb Al Darmaki
	Title:	Executive Director
	/s/ KHALAF AL NAJJAS
	By:	Khalaf Al Najjas
	Title:	Assistant Director
	PROCIFIC
	/s/ AHMED GHUBASH
	By:	Ahmed Ghubash
	Title:	Director