1993

5.6

2000

6.1

2003

7.5

2003

7.0

2004

8.1

1989

8.3

1998

8.8

2006

6.4

2016

8.6

2008

7.1

1992

6.8

2020

6.4

1995

6.2

2012

7.4

2017

7.7

1986

7.2

2004

8.5

1998

8.5

2007

7.9