1968

5.8

2006

5.2

1953

6.9

2004

7.2

1980

7.7

2004

6.8

2005

5.9

2019

4.0

2012

6.4

2003

6.0

2006

5.0

2001

5.2

1982

7.4

1996

5.8

2008

6.5

1984

6.5

2017

6.3

2009

7.3

1991

6.6

1996

7.3