1982

6.7

1998

5.3

1963

7.0

1990

6.0

2003

7.4

1992

7.4

2008

6.6

2006

4.0

1986

6.0

1996

6.5

2002

5.8

1989

6.8

1999

6.5

2000

6.4

1980

0.0

1973

6.9

1934

6.1

1988

6.3

1994

5.8

1969

7.0