1966

15

1967

11.6

-3.4

-23

1968

10.4

-1.2

-10

1969

13.2

2.8

27

1970

13.7

0.6

4

1971

13.8

0.09

1

1972

15.8

1.9

14

1973

15.0

-0.7

-5

1974

14.8

-0.12

-1

1975

16.5

1.7

12

1976

15.8

-0.7

-4

1977

17.4

1.56

10

1978

20.2

2.8

16

1979

18.9

-1.34

-6

1980

18.3

-0.59

-3

1981

20.9

2.7

15

1982

22.4

1.4

7

1983

33.1

10.7

48

1984

36.9

3.9

12

1985

49.2

12.3

33

1986

64.9

15.8

32

1987

129.4

64.4

99

1988

195.7

66.3

51

1989

268.1

72.4

37

1990

506.8

238.7

89

1991

840

333.2

66

1992

1002.3

162.3

19

1993

3080.6

2078.3

207

1994

3727.4

646.8

21