2005

7.4

1968

7.1

2002

8.2

2001

8.1

1990

7.8

2006

6.1

2005

8.8

2000

6.2

1979

6.7

1999

7.6

2006

7.1

2005

5.0

1997

3.5

2002

7.5

1974

4.8

2010

10.0

1988

5.7

1999

7.7

1995

7.6

2014

8.3