1997

7.6

1991

8.1

1995

7.0

2003

6.2

1979

8.2

1927

8.1

1968

8.1

1995

7.6

1985

7.7

2005

6.5

1982

7.9

1982

6.7

1988

7.9

2009

6.1

2022

7.0

1997

7.6

1972

6.4

1999

7.4

1983

7.3

1984

6.2