2000

8.2

1982

7.9

1994

8.3

2002

6.9

1976

8.1

1998

7.8

1982

6.7

1979

6.5

2008

8.5

1997

7.4

2005

7.5

2014

6.4

1932

7.4

2003

5.9

1968

7.3

1970

7.1

1995

6.5

1992

6.9

2005

6.3

1963

8.1