1987

7.1

1996

7.4

1992

3.8

1981

5.5

0.0

1990

3.2

1988

5.3

1995

7.5

1979

6.7

1986

6.1

1994

5.3

1991

4.0

2001

3.7

2002

5.0

1992

5.3

1997

6.3

1990

7.6