1972

6.7

2012

6.7

1984

7.1

1999

7.4

2008

8.5

1983

7.9

2003

6.3

2013

6.9

1991

5.3

2007

6.1

2013

7.1

2016

7.0

2016

6.2

2009

6.7

2012

6.3

2002

7.3

2021

7.5

2015

7.9

2007

6.1

2015

6.7