2007

7.3

2006

7.8

2020

5.3

1991

6.8

2001

7.7

2004

7.3

1970

7.0

2009

6.8

2008

6.3

2007

4.7

2008

6.6

2014

6.1

1951

5.4

1973

7.5

2004

6.5

1984

4.3

1985

6.2

1967

6.6

1968

6.4

1981

4.5