1993

5.1

2001

6.5

1987

6.5

1989

7.2

2000

5.8

1974

6.1

1989

6.6

2001

5.6

1994

5.5

1959

7.0

2003

6.5

1994

6.8

1938

7.5

1999

6.1

2005

5.8

2002

6.1

2003

6.0

2003

6.9

1980

6.8

1987

6.9