2015

6.9

2005

5.5

2009

5.3

2021

6.2

2008

7.2

1998

6.0

2006

6.9

1996

5.9

2009

6.1

1994

5.4

2004

5.7

2007

7.3

6.4

2014

7.0

2012

7.1

5.0

2015

6.4

1969

8.3

2005

7.2