2021

6.2

2015

6.4

6.4

5.0

1975

4.5

2004

6.0

1969

8.3

1992

6.8

2005

5.5

2009

7.9

2009

6.1

2014

7.0

2014

7.8

2009

7.6

2012

5.8

2008

7.2

1996

6.6

2010

5.9

2006

6.9

2015

6.9