1979

7.0

1985

6.5

1993

8.3

1999

7.6

1982

0.0

1997

7.5

2006

5.7

1988

5.7

1968

0.0

1969

8.3

1991

6.8

2003

6.6

2006

7.4

2001

5.6

2009

8.1

2004

0.0

1969

0.0

2023

4.5

0.0

2002

6.4