2000

5.5

1990

6.1

1962

7.6

2007

5.5

1983

6.5

1988

6.2

2001

5.9

2002

5.2

1999

8.0

1979

6.7

1993

6.2

2007

7.4

1986

6.7

1985

5.7

1988

6.5

1980

5.3

1970

7.3

1972

7.9

2002

6.3

1981

7.0