2006

7.8

2005

8.1

1999

7.6

2012

5.5

1971

7.6

1996

8.5

1994

7.8

1976

7.4

2000

4.0

2007

1.0

2004

6.8

2002

7.1

1995

7.7

1967

7.4

2002

8.0

1984

7.1

2014

8.5

2006

5.0

2011

8.1

2021

0.0