1980

8.4

1983

7.9

1979

6.2

1997

7.1

1999

7.1

1987

6.8

2022

6.3

1985

6.9

2023

4.6

1981

6.7

1977

3.0

2006

4.4

2021

5.0

2008

4.2

1980

5.4

1988

7.0

2005

6.7

2013

6.5

2009

4.1

2007

8.0