1996

7.6

2005

7.0

1998

6.4

2002

7.6

2004

7.4

1997

7.1

1984

8.4

2003

7.7

1999

8.5

2003

7.2

1964

7.2

2006

7.5

1992

7.4

2003

7.2

2018

6.2

2001

6.6

1967

7.4

2007

7.5

1976

6.4

2013

6.6