Nine Months

Year Ended December 31

Ended September 30

-------------------------------------------------------------------------------------

-----------------------------

1995

1996

1997

1998

1999

1999

2000

--------------

--------------

----------------

----------------

--------------

-------------

-------------

Interest costs

$

135,130

$

128,360

$

137,350

$

159,870

$

146,124

$

109,096

$

114,627

Interest capitalized during the period

3,549

17,778

10,575

1,341

238

212

743

Interest factor related to noncapitalized leases (a)

8,600

12,982

11,931

11,308

13,065

9,571

8,710

--------------

--------------

----------------

----------------

--------------

-------------

-------------

Total fixed charges

147,279

159,120

159,856

172,519

159,427

118,879

124,080

Preferred stock dividend requirements -- pretax

59,850

65,207

44,686

19,940

17,129

16,940

15,807

--------------

--------------

----------------

----------------

--------------

-------------

-------------

Combined fixed charges and preferred
   dividend requirements

$

207,129

$

224,327

$

204,542

$

192,459

$

176,556

$

135,819

$

139,887

========

========

=========

=========

========

=======

=======

Income (loss) before income taxes,
   minority interest, and cumulative effect
   of accounting change

$

589,410

$

31,340

$

(28,930

)

$

(16,878

)

$

355,940

$

225,123

$

266,580

Undistributed (earnings) losses of less than 50%
   owned entities, net of distributions received

(36,861

)

(1,290

)

5,180

3,791

(6,115

)

(6,024

)

(3,609

)

Total fixed charges

147,279

159,120

159,856

172,519

159,427

118,879

124,080

Less interest capitalized

(3,549

)

(17,778

)

(10,575

)

(1,341

)

(238

)

(212

)

(743

)

--------------

--------------

----------------

----------------

--------------

-------------

-------------

Total earnings before fixed charges

$

696,279

$

171,392

$

125,531

$

158,091

$

509,014

$

337,766

$

386,308

========

========

=========

=========

========

=======

=======

Ratio of earnings to combined fixed charges and
   preferred dividend requirements

3.36

-

-

-

2.88

2.49

2.76

Excess of combined fixed charges and preferred
   dividend requirements over total earnings
   before fixed charges

$

-

$

52,935

$

79,011

$

34,368

$

-

$

-

$

-

(a) Interest expense for operating leases with terms of one year or longer is based on an imputed interest rate for each lease.