2006

8.2

2002

8.1

2010

7.9

2000

7.6

1996

8.7

1965

5.5

1999

7.3

2007

7.6

1983

6.3

2004

7.4

1972

6.9

1986

7.9

1990

7.4

2005

7.0

1984

0.0

1998

0.0

1991

7.7

1996

6.9

2014

8.4

2003

7.8