1990

8.3

2014

3.0

1996

8.0

1954

6.3

2017

7.0

1996

6.7

2007

6.1

2023

4.0

2008

6.0

2006

7.8

2015

5.1

2006

4.2

2005

7.5

2002

5.1

1971

4.8

2009

6.1

1977

7.3

2014

3.7

1987

7.7

2011

3.8