2004

6.0

2001

6.1

2007

6.7

2000

5.1

1994

6.1

1994

6.8

2003

6.9

1996

7.3

1986

6.1

2001

5.6

2016

5.3

2016

6.7

1972

6.1

1973

5.1

2000

5.8

2014

5.8

1994

8.0

1991

0.0

2007

3.7

1967

5.9