1996

7.5

2007

7.3

2016

5.9

2007

7.5

1984

7.1

2006

6.2

2017

6.5

2015

5.7

1987

4.1

1976

4.7

2016

5.9

2001

8.9

2019

6.7

1970

6.3

1998

6.0

2009

5.3

1987

7.5

1985

6.2

2016

6.9

2012

6.6