1980

7.5

1993

6.7

1978

6.5

1981

6.4

1999

6.0

1979

6.1

1989

5.5

1982

7.5

1985

6.6

2001

6.9

1986

4.0

1992

6.3

1988

6.1

2002

6.5

1943

4.8

1991

5.6

1980

6.5

1989

6.5

1990

5.8

1990

7.6