1980

6.6

2003

5.9

2005

5.3

2002

6.8

1997

5.9

2014

6.7

1994

7.6

2001

7.3

1970

7.1

2005

8.0

1988

6.3

1964

7.1

2000

0.0

2009

6.6

2024

0.0

2017

6.9

2007

4.0

1996

6.4

2010

3.9

2017

5.0