2009

7.6

2010

8.0

2002

8.3

2002

8.6

2005

7.0

2006

7.1

2000

6.8

2004

8.0

1987

6.1

2005

7.9

2001

8.0

1995

8.2

1960

7.2

2002

6.0

1972

7.6

1994

6.7

2002

7.2

2001

5.5

1997

6.6

2004

7.2