1996

7.8

1987

7.8

2011

8.5

1989

8.0

2008

8.9

2005

8.1

2020

7.3

2001

8.6

2021

8.2

2019

8.7

2020

8.1

2010

8.1

2017

8.5

2013

8.1

2001

8.0

2013

7.7

2021

8.8

2004

7.9

2013

8.2

2021

8.1