1989

7.9

2016

8.4

2004

8.3

1999

9.5

2020

7.5

2021

7.4

2009

7.9

2004

8.0

2008

6.0

1975

7.0

2008

5.8

2017

8.0

2013

6.4

1991

7.7

1990

7.4

2015

7.3

2010

7.8

1997

7.0

2009

8.0

2009

7.3