1975

7.2

2002

6.7

2006

8.0

1997

7.9

1984

7.5

1997

8.4

1973

7.1

2003

6.4

1977

7.0

2007

6.1

1967

6.9

2005

6.6

2006

7.8

2006

6.9

2016

6.0

1987

6.5

2024

0.0

2004

5.1

1988

6.0

2021

0.0