1993

6.5

2019

6.7

2020

6.5

2005

5.2

2010

6.6

2019

6.6

1980

5.9

1989

5.5

2019

5.4

1993

6.5

2008

5.8

1967

6.1

2011

7.1

1994

6.6

2011

6.8

2014

6.0

1953

7.2

1976

6.2

1996

6.9

2006

6.1