1999

7.4

2006

7.4

1983

7.5

2003

8.2

1990

7.5

2013

8.0

1996

7.5

2016

7.3

1984

7.2

2006

7.8

2008

7.7

2009

7.6

2000

6.9

2009

8.3

1989

8.0

2017

6.6

1997

8.0

2002

7.7

1993

7.7

2007

8.0