2009

6.6

2007

4.0

1997

6.1

2005

4.0

1988

6.3

2005

5.3

2001

7.3

1996

6.4

1970

0.0

2016

3.3

2002

6.8

2013

8.5

2003

5.9

1964

7.1

1970

7.2

1996

5.7

2014

6.7

2010

3.9

1996

5.3

2024

0.0