2007

6.2

1994

8.5

1971

6.4

2005

6.4

2001

7.4

1977

7.1

1996

6.5

1990

5.9

1997

6.8

2006

7.0

2000

4.8

1970

6.1

2007

6.5

2002

7.4

2014

10.0

1995

6.5

2008

6.2

1998

7.0

1999

6.5

2005

4.3