2003

5.5

1992

8.1

1997

6.6

2012

6.6

2004

7.2

2009

7.7

1976

5.9

1991

9.5

2007

6.2

1996

5.6

1984

8.5

2006

6.7

2002

6.3

1985

7.0

1995

6.7

1976

7.0

1998

3.3