1972

4.0

2011

7.2

2017

6.7

2004

5.8

2010

9.1

2000

7.2

1999

7.0

2011

7.5

2006

5.0

2011

5.5

2009

5.7

2023

10.0

2005

6.5

2007

5.7

2007

6.4

2001

6.4

1988

6.0

1987

6.5

2012

6.8