2008

6.4

1992

6.0

2005

5.6

1999

6.1

2010

4.0

2001

6.2

2020

8.2

2006

6.0

2009

0.0

1987

6.1

1975

8.8

2020

6.2

1958

0.0

1977

5.8

1951

5.2

1965

7.2

2008

6.2

2014

6.4

1943

8.2

2006

7.2