1990

6.9

2019

8.0

2017

6.5

2008

8.9

2001

7.6

2016

7.3

1987

8.4

2015

8.2

2010

8.1

2003

7.5

2004

7.9

2019

8.7

2017

7.1

1997

8.3

1988

7.6

2016

8.4

1995

7.8

2008

8.4

1994

8.4

2005

8.2