1974

6.3

2014

5.8

2023

7.0

2009

5.9

1987

5.3

2020

7.3

1980

6.3

2007

6.4

2020

6.0

2013

6.6

1978

6.8

2014

5.9

2023

7.6

1972

7.4

1990

5.8

2005

5.2

2004

6.0

2008

5.8

1987

5.8

2018

6.7