1976

4.9

2009

5.9

2001

6.2

2018

7.0

1999

6.5

1997

7.5

2007

7.2

1979

6.5

1987

6.8

1956

6.7

1999

6.7

1985

4.4

2016

4.6

2021

0.0

2005

5.6

2004

5.4

2003

6.6

0.0

2023

7.0

2021

5.6