2004

6.2

1992

6.2

2006

6.9

1982

6.7

1975

6.3

2001

7.8

1993

6.3

1966

7.3

1999

7.0

1958

7.6

1991

6.2

2002

5.7

1997

6.9

2002

5.3

2001

5.9

1946

7.6

1968

7.1

1979

7.2

1994

5.0

2021

6.3