1984

6.6

1986

5.6

2008

6.2

2009

7.4

2021

9.2

2010

7.2

2004

5.8

1991

7.0

1955

7.2

2006

6.6

1998

6.4

2007

7.5

1971

6.1

2012

6.6

1943

8.0

1998

5.2

2008

6.0

1992

6.3

2021

7.2

1989

7.2