1982

4.0

2001

6.8

2001

6.5

2001

7.2

2002

6.0

2004

8.6

1985

5.7

1995

7.3

2004

6.5

1986

3.2

2008

6.4

1975

5.0

1987

8.4

2001

6.8

1991

6.0

1997

7.7

1999

8.3

1981

6.6

1996

2.7

2002

7.2