1985

8.3

2020

8.4

2004

8.0

1971

6.8

2014

7.8

2008

8.5

1964

7.0

2016

5.9

2001

6.8

1997

6.2

1967

6.6

2000

7.2

2014

5.9

1987

5.5

1971

6.4

2016

7.4

2016

6.2

2018

6.8

2011

5.8

1999

5.6