2004

6.2

1992

6.2

2006

6.9

2018

4.7

1983

5.9

1949

7.9

2006

6.1

2006

5.3

2008

6.6

2007

6.5

2005

5.4

2001

7.2

1997

6.8

2014

6.1

1969

6.3

1932

7.4

2000

6.9

1968

7.1

1957

7.1

1987

7.3