1973

6.8

2009

7.4

2013

6.7

1994

8.0

2004

8.3

2012

7.3

1985

7.6

2003

8.2

2017

6.8

2023

8.6

2017

6.1

1980

7.5

2008

7.6

2002

6.4

2001

7.6

2012

6.4

2001

6.6

1996

7.5

2004

7.3

2005

7.7