2009

7.0

1987

6.8

2007

6.3

1968

8.1

1962

7.0

2008

8.5

2002

6.6

2009

7.6

2000

6.4

1995

6.3

1989

7.0

1989

6.4

1998

8.2

1995

7.9

1990

7.3

2003

6.5

2006

6.1

2012

6.9

1993

7.7