1973

7.4

2005

6.7

1999

6.3

2002

6.0

1995

7.3

1932

7.0

1967

7.3

1955

7.3

1967

7.7

2002

6.3

2014

5.8

1976

5.9

1985

6.1

2004

4.9

1998

5.2

1998

6.9

2003

6.5

1987

6.5

2005

4.9

1994

6.0