1965

8.0

2009

7.9

1972

8.7

1990

7.5

2006

7.8

2012

6.5

2000

5.2

2002

8.4

2020

7.3

2010

6.2

1991

8.3

1934

7.8

1993

8.0

2007

7.2

2006

6.7

2012

6.9

2004

7.0

2007

5.6

1973

8.0

1973

7.3