1997

5.9

2009

6.6

2014

6.7

2007

4.0

2002

6.8

2003

5.9

2017

6.9

2005

5.3

2001

7.3

1988

6.3

1996

6.4

2024

0.0

1970

7.1

1964

7.1

2005

8.0

2017

1.0

2018

4.0

2010

4.2

1983

0.0

1994

7.6