1997

3.9

1996

6.4

2001

6.8

1999

7.9

1995

4.0

1994

6.0

2002

6.2

1993

6.4

1965

6.0

1990

6.3

1994

7.8

1982

5.0

1991

4.4

1991

6.6

1984

7.2

1982

7.5

1986

7.1

1997

5.4

1992

6.7

1989

6.0

1987

7.7

2009

7.9

1984

7.5

1984

7.3

1995

7.6

1992

6.0

1989

8.3

1995

6.0

2001

7.6

1986

0.0

1995

6.5

1993

6.7

1986

6.2

1991

4.9

1954

7.8

1993

8.3

1987

6.3