2009

7.7

1985

7.9

1989

8.4

2015

8.3

1996

6.4

2007

8.5

2004

8.6

2018

8.4

2010

7.7

2004

8.3

1997

8.1

1967

7.7

2012

7.5

2013

8.2

2003

7.8

2006

8.2

2002

8.2

1999

7.4

2008

7.4

2005

8.1