2005

6.3

1985

5.8

1975

6.4

1965

6.4

2005

6.0

1982

5.4

1980

5.1

1961

6.9

2008

5.2

2006

7.0

1999

4.4

1953

6.8

2019

6.5

1988

4.9

1966

8.0

1990

6.8

2009

4.3

2004

5.7

2005

6.4

2011

5.8