1992

6.8

1996

6.3

2023

7.9

1994

8.1

2015

7.3

1964

7.5

1970

6.2

2003

8.2

2016

6.9

2005

7.8

2011

7.4

2008

7.3

2011

7.2

2011

6.0

1980

8.3

2012

8.1

2012

6.7

2016

7.0

2017

9.7

2004

5.7