1990

6.2

1939

6.9

1992

6.2

1982

6.7

2018

4.7

1944

8.1

1994

7.0

1966

7.3

1983

5.9

1999

7.0

1949

7.9

2006

6.1

2006

6.0

2008

6.6

2007

6.5

2005

5.4

2009

6.3

2001

7.2

2003

6.3

1997

7.8