2004

8.3

1998

7.2

5.8

1992

5.8

1996

5.4

2004

8.6

1993

6.7

2001

6.6

2003

8.2

2010

7.8

2023

7.7

2001

7.6

2022

7.9

1991

7.7

2007

8.1

1995

8.2

2015

7.2

2020

6.9

2013

7.5

2016

7.0