2006

8.6

1992

6.7

1997

7.3

2008

7.9

2002

7.5

2017

7.3

2010

8.0

2007

7.1

2014

6.8

2010

7.8

2003

8.2

2000

6.6

1996

7.4

1991

7.7

2002

7.7

2009

7.0

2001

8.6

1975

8.3

2004

7.9

2017

7.8