2000

6.5

1997

5.0

1996

3.5

2001

7.2

1976

7.1

2001

6.0

2007

8.2

1977

0.0

1987

7.2

2010

7.5

1987

5.8

2001

4.4

2000

7.2

2000

5.1

1999

5.2

2003

6.8

2015

7.6

1978

5.2

2011

5.0

1998

6.4