1978

7.5

2004

8.6

1999

7.4

2010

8.5

1989

8.3

2019

8.7

2008

8.4

2007

7.9

1996

6.8

2011

7.1

2019

8.0

2023

8.5

2010

8.0

2000

8.0

2011

8.3

2004

7.9

2005

8.1

2002

8.3

2016

8.6

2022

8.4