2008

5.9

1985

8.3

1995

8.0

1990

7.4

1997

7.9

1999

8.4

2007

6.3

1994

8.7

1987

7.3

2006

6.7

2010

7.5

2007

7.8

2006

6.4

2001

6.1

1977

7.4

1992

6.8

2016

7.6

2010

8.4

2011

7.3

2007

7.1