1990

6.8

1965

6.4

1988

5.0

2005

6.0

2006

7.0

1982

5.5

1985

5.8

1980

5.1

1975

6.4

2005

6.3

1991

5.0

1961

7.1

2010

3.5

2008

5.2

1961

6.9

2019

6.5

1999

4.4

1974

5.5

1927

6.5

2004

5.7