Joint Filing Agreement March , 2012

CUSIP NO. 000000000 13G Page 1 of 15

Exhibit 99.1

Joint Filing Agreement

March     , 2012

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, Commonwealth Bank of Australia, Colonial Holding Company Limited, Commonwealth Insurance Holdings Limited, Colonial First State Group Limited, First State Investments (Hong Kong) Limited, and First State Investment Management (UK) Limited each hereby agree to the joint filing of this statement on Schedule 13G (including any and all amendments hereto). In addition, each party to this Agreement expressly authorizes each other party to this Agreement to file on its behalf any and all amendments to such Statement on Schedule 13G. A copy of this Agreement shall be attached as an exhibit to the Statement on Schedule 13G filed on behalf of each of the parties hereto, to which this Agreement relates.

This Agreement may be executed in multiple counterparts, each of which shall constitute an original, one and the same instrument.

Commonwealth Bank of Australia
By:		/s/ Xxxx Xxxxxx Xxxxxx
Name:		Xxxx Xxxxxx Xxxxxx
Title:		Company Secretary
Colonial Holding Company Limited
By:		/s/ Xxxx Xxxxxx Xxxxxx
Name:		Xxxx Xxxxxx Xxxxxx
Title:		Director
Commonwealth Insurance Holdings Limited
By:		/s/ Xxxx Xxxxxx Xxxxxx
Name:		Xxxx Xxxxxx Xxxxxx
Title:		Director
Colonial First State Group Limited
By:		/s/ Xxxx Xxxxxx Xxxxxx
Name:		Xxxx Xxxxxx Xxxxxx
Title:		Director
First State Investments (Hong Kong) Limited
By:		/s/ Xxxxxxx Xxxxxxxxx
Name:		Xxxxxxx Xxxxxxxxx
Title:		Director
First State Investment Management (UK) Limited
By:		/s/ Xxxx Xxxxxx
Name:		Xxxx Xxxxxx
Title:		Director