1982

6.2

1993

7.2

1994

7.5

2005

7.2

2003

5.3

1953

4.6

1994

5.4

1969

6.7

1982

6.0

1982

7.3

2006

7.6

1963

4.0

1926

0.0

1969

1.0

2009

8.0

2000

6.5

1970

4.2

1986

4.2

1975

7.4

1997

7.3