1992

6.9

2012

6.9

2017

6.9

1991

5.6

1994

5.3

2008

5.3

1988

6.9

1986

6.5

2021

6.1

2010

5.9

2018

6.5

2009

7.9

1980

5.5

2002

6.0

1964

5.8

1982

6.8

2006

4.3

1955

7.2

2011

5.5

1920

7.4