1986

6.4

1958

5.9

1976

2.5

1992

6.2

1974

4.8

1990

4.6

1963

7.4

1994

6.4

1939

7.6

1999

7.0

2006

6.8

2009

1.0

1967

6.3

1984

7.2

2006

6.3

2013

4.8

1995

6.9

2005

5.9

2002

5.5

1990

6.5