1992

6.8

1997

8.1

2008

7.5

2012

8.4

2008

7.6

2015

7.3

2004

8.3

1993

6.6

2023

8.7

1964

7.9

1990

6.9

2008

7.4

1995

7.5

2018

7.1

2004

8.6

1999

7.0

2016

8.5

2017

6.1

2018

7.7

2013

8.6