1960

8.2

1983

7.2

1952

8.1

2002

7.7

2004

8.0

2005

7.8

2007

7.7

2009

7.7

1990

7.5

1992

6.8

2003

7.1

2025

0.0

2018

5.8

1995

6.2

1996

6.1

1994

6.2

1999

7.0

1998

6.7

2000

6.8

2008

6.8