1981

10.0

1990

6.5

1984

6.1

2009

6.0

2007

6.9

1981

7.1

1988

5.4

2012

7.1

1962

7.3

2023

7.8

2004

7.8

1925

8.0

2005

7.5

1997

7.7

1996

7.1

1999

7.2

1994

7.2

1992

6.8

1993

7.4

1987

6.6