1977

6.3

2020

7.2

2003

5.7

2011

6.6

2016

6.1

2010

6.4

2011

6.3

2004

7.3

1993

5.9

2004

6.6

2003

5.3

2021

6.4

2013

6.5

1991

6.2

2014

5.1

1969

7.6

2008

7.1

2013

6.1

2009

6.8