1968

5.0

1978

6.4

2003

5.8

2006

5.9

1997

5.4

2002

7.4

2006

6.4

2007

6.3

2002

5.8

1966

6.8

1964

5.3

2004

6.7

2025

0.0

1990

6.8

2005

5.8

2000

7.0

1974

6.4

1997

6.3

1958

5.2

2009

6.9