1927

8.1

2000

7.6

2000

8.2

1994

8.3

1976

8.1

2001

7.8

1992

7.0

1977

6.7

1974

6.3

1982

6.7

2014

7.9

2005

7.7

1991

6.6

1997

5.9

1999

7.4

1989

6.8

1965

7.2

2021

6.5

1998

7.1

1993

7.7