2001

7.7

2007

7.1

1978

4.0

1997

4.8

1985

5.5

2005

4.2

1986

8.0

1986

6.8

1979

8.5

1992

7.3

1991

6.0

1991

5.9

1991

6.3

1994

0.0

1990

7.4

1986

4.7

1984

6.2

2007

7.2

1993

6.3

1985

6.6

2000

6.2

1991

5.5

2002

5.7

1991

4.9

1999

7.5

1990

5.9

1997

6.8

1973

6.4

1998

8.3

1988

6.1

1999

7.9

1990

6.7

1993

4.8

1994

6.1

1994

6.0

1994

6.5

1994

6.3