1975

6.7

2000

6.3

1982

6.1

2017

5.0

1979

5.9

1972

6.5

1954

6.1

1987

7.1

2003

5.2

2000

7.0

1995

6.7

1942

7.3

2005

6.0

2019

6.7

2004

6.0

1999

7.0

2007

6.2

2006

7.5

2008

6.6

2001

6.5