1976

7.0

2005

7.3

2006

7.2

2005

6.6

2006

5.2

2002

6.2

1997

7.1

1981

6.5

2009

6.1

2005

6.3

1993

7.4

1994

6.2

2007

5.0

2008

6.7

1997

6.6

2023

9.2

2006

5.7

1993

6.5

2002

6.6

2005

5.8