1985

6.3

2000

7.0

1974

6.2

2001

6.6

2003

8.7

1990

5.7

1986

6.7

1976

8.0

1998

7.4

1997

8.2

2001

6.0

1999

7.9

1969

7.3

1992

7.2

2020

7.9

2011

0.0

2018

6.0

1997

4.0

1993

6.0

1995

0.0