1941

6.2

1972

4.0

1982

7.6

2000

7.2

2004

5.8

2004

7.2

1993

6.5

1995

6.8

2008

6.5

1984

7.1

1992

6.3

2012

7.6

1990

6.5

2003

6.1

1994

8.9

1988

6.8

1969

6.9

2004

5.7

7.3