1996

6.0

1986

6.1

1995

6.7

1998

7.0

2023

0.0

1972

6.2

1997

5.5

1998

6.3

2006

6.0

2004

6.8

2009

5.6

2007

6.1

2005

6.2

1985

4.0

1963

7.1

1997

7.1

2001

6.9

1984

8.0

2000

5.9

2003

7.5