1987

7.1

1990

7.4

1992

6.0

2000

7.5

1993

7.1

1994

7.8

1999

10.0

1996

8.1

1979

6.8

1985

0.0

1989

5.4

1999

5.0

1994

5.6

1988

6.2

1995

7.6

2000

5.1

2018

4.7

1987

5.9

2001

6.4

1997

8.0

1998

4.0

2002

7.3