1981

7.3

2001

6.2

2007

0.0

2006

7.6

1979

6.5

1997

7.5

0.0

1988

7.1

1987

6.8

2021

5.6

2018

0.0

1956

6.7

1999

6.7

2003

6.6

2004

5.4

2005

5.6

2016

4.6

2023

7.0

2021

0.0

1985

4.4