1977

6.3

1978

6.1

2006

6.1

2005

4.9

2002

5.1

1997

5.5

2025

0.0

2015

6.3

1979

6.2

2025

5.6

2003

6.0

1995

6.5

1998

4.1

2004

5.2

2003

5.0

1967

6.9

1975

3.1

2001

4.0

2017

0.0

2002

5.5