1978

9.7

1998

7.1

2014

7.7

2019

8.7

2001

8.1

2006

5.4

2011

8.5

2018

8.2

2016

8.6

1999

7.9

2016

7.0

2021

7.6

2008

7.6

2005

6.1

2016

8.3

1990

8.0

2009

7.1

2016

10.0

2011

8.2

2014

8.3