1992

6.8

1991

7.3

2016

7.9

1996

7.7

1988

7.8

2017

8.2

2017

6.4

2023

6.9

2009

7.5

2012

7.7

2001

6.2

2021

6.9

1996

7.3

1999

7.5

1994

7.5

2011

7.3

2015

7.8

2011

7.8

2015

8.1

2021

7.9