1962

6.9

2001

6.4

1967

5.0

1967

4.1

1963

5.1

2002

6.5

1997

5.6

1987

6.6

1994

5.9

1993

6.2

1992

6.0

2006

6.5

2006

5.5

1996

5.3

2009

6.8

1930

4.1

1994

6.2

1967

7.3

1984

6.8

1997

5.2