2006

7.8

2020

5.3

1991

6.8

2001

7.7

2004

7.3

2008

6.3

2007

4.7

1973

7.5

2004

6.5

1985

6.2

1967

6.6

1968

6.4

1981

4.5

1982

5.5

1961

6.0

2017

6.6

2002

6.0

1936

4.7

2015

6.0

1954

4.6