1982

1,595,010

43,945

2.76

26,173

1.64

1983

1,652,788

42,589

2.58

24,635

1.49

1984

1,720,269

44,257

2.57

24,762

1.44

1985

1,774,826

43,825

2.47

23,167

1.31

1986

1,834,872

46,087

2.51

25,017

1.36

1987

1,921,204

46,390

2.41

24,094

1.25

1988

2,025,962

47,087

2.32

23,833

1.18

1989

2,096,487

45,582

2.17

22,424

1.07

1990

2,144,362

44,599

2.08

22,587

1.05

1991

2,172,050

41,508

1.91

20,159

0.93

1992

2,247,151

39,250

1.75

18,290

0.81

1993

2,296,378

40,150

1.75

17,908

0.78

1994

2,357,588

40,716

1.73

17,308

0.73

1995

2,422,696

41,817

1.73

17,732

0.73

1996

2,485,848

42,065

1.69

17,749

0.71

1997

2,561,695

42,013

1.64

16,711

0.65

1998

2,631,522

41,501

1.58

16,673

0.63

1999

2,691,056

41,717

1.55

16,572

0.62

2000

2,749,803

41,945

1.53

17,380

0.63

2001

2,778,338

42,116

1.52

17,448

0.63