Three Months

Year Ended December 31

Ended March 31

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

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

1995

1996

1997

1998

1999

1999

2000

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

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

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

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

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

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

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

(dollar amounts expressed in thousands)

Interest costs

$

135,130

$

128,360

$

137,350

$

159,870

$

146,124

$

37,590

$

36,984

Interest capitalized during the period

3,549

17,778

10,575

1,341

238

61

125

Interest factor related to noncapitalized leases(1)

8,600

12,982

11,931

11,308

13,065

2,998

3,033

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

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

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

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

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

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

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

Total fixed charges

147,279

159,120

159,856

172,519

159,427

40,649

40,142

Preferred stock dividend requirements -- pretax

59,850

65,207

44,686

19,940

17,129

8,754

8,091

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

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

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

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

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

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

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

Combined fixed charges and preferred
   dividend requirements

$

207,129

$

224,327

$

204,542

$

192,459

$

176,556

$

49,403

$

48,233

========

========

=========

=========

========

=======

========

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

$

589,410

$

31,340

$

(28,930

)

$

(16,878

)

$

355,940

$

33,535

$

71,846

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

(36,861

)

(1,290

)

5,180

3,791

(6,115

)

(746

)

(2,321

)

Total fixed charges

147,279

159,120

159,856

172,519

159,427

40,649

40,142

Less interest capitalized

(3,549

)

(17,778

)

(10,575

)

(1,341

)

(238

)

(61

)

(125

)

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

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

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

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

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

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

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

Total earnings before fixed charges

$

696,279

$

171,392

$

125,531

$

158,091

$

509,014

$

73,377

$

109,542

========

========

=========

=========

========

=======

========

Ratio of earnings to combined fixed charges and
   preferred dividend requirements

3.36

-

-

-

2.88

1.49

2.27

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

$

-

$

52,935

$

79,011

$

34,368

$

-

$

-

$

-