1998

6.9

2007

5.4

1977

6.8

1986

0.0

1983

6.0

1995

6.4

1992

6.9

2005

6.3

1963

8.1

1998

6.8

2006

6.9

2004

5.7

2003

7.4

1996

6.8

2001

6.2

2000

6.0

2001

6.8

1990

7.0

1999

8.5

1992

8.1