2001

7.7

1990

6.4

1986

4.7

1995

7.3

1982

3.7

2003

4.7

1978

5.6

1973

7.0

1990

7.4

2000

6.0

1998

7.0

1996

7.1

1976

4.6

2002

5.3

1999

7.9