1927

8.1

1998

8.3

1987

7.3

1994

8.3

1983

8.2

2001

7.8

2003

7.2

1999

6.8

2002

7.1

1954

7.2

1970

7.5

2007

6.7

2002

7.0

2008

6.4

1985

4.4

1987

6.9

1991

7.7

2009

7.4

1992

7.0

1984

6.4