1984

7.2

1993

7.1

1992

6.8

2000

7.5

2005

7.9

2009

7.7

2003

8.2

2016

7.3

2000

6.9

2004

8.3

2019

7.0

2005

6.8

1996

7.5

2008

7.2

2012

7.4

2011

5.9

2015

7.0

2006

7.8

1989

6.8

2003

7.8