1967

5.9

1997

6.4

2001

5.9

1999

5.2

1996

6.2

1995

7.0

2000

6.2

2000

6.7

1999

5.4

2006

5.6

2004

6.9

2005

6.7

2007

6.2

2004

6.0

2014

6.4

1973

7.1

2023

3.0

2023

10.0

2016

7.3

2002

0.0