1980

63,100

12,100

75,200

6.78

427,818

$410

$2,780

1981

63,700

16,800

80,500

6.59

419,783

$440

$2,900

1982

67,400

17,300

84,700

9.08

611,992

$344

$3,124

1983

71,400

19,300

90,700

7.06

504,084

$351

$2,478

1984

75,800

16,300

92,100

6.27

475,266

$304

$1,906

1985

77,725

15,369

93,094

7.42

576,720

$230

$1,707

1986

81,700

12,400

94,100

7.59

620,103

$307

$2,330

1987

83,800

10,200

94,000

6.44

539,672

$435

$2,801

1988

85,400

7,400

92,800

9.02

770,308

$363

$3,274

1989

80,700

8,700

89,400

7.81

630,267

$449

$3,507

1990

78,000

9,300

87,300

8.27

645,060

$429

$3,548

1991

75,500

9,900

85,400

8.21

619,855

$438

$3,596

1992

77,300

7,000

84,300

8.34

644,682

$356

$2,969

1993

77,800

5,000

82,800

8.12

631,736

$574

$4,661

1994

77,800

6,200

84,000

7.74

602,172

$515

$3,986

1995

76,200

9,300

85,500

9.42

717,804

$525

$4,946

1996

74,500

13,564

88,064

7.95

592,275

$650

$5,168

1997

81,000

N/A

N/A

10.19

825,390

$448

$4,565

1998

83,000

N/A

N/A

7.29

605,070

$484

$3,528