2005

5.5

2007

5.7

2006

5.9

2001

7.3

1984

6.0

1997

6.8

2005

6.7

2005

6.8

1997

7.5

2001

7.6

1972

3.7

1987

7.1

2001

7.4

1991

5.9

1989

7.0

2005

6.6

1995

6.5

2003

6.4

1989

6.7

1990

6.7