1958

4.8

1974

6.4

1952

7.3

1994

4.1

2008

0.0

2006

5.8

1979

7.7

1998

7.4

2004

6.0

1937

4.9

1996

5.5

1955

7.4

1976

6.6

1978

5.2

1989

7.4

2005

6.5

2007

6.5

1964

0.0

1998

5.1

2008

6.7