1981

1.0

1999

8.1

1991

6.0

1992

7.4

2013

7.1

1983

0.0

1985

5.8

1987

0.0

1994

8.3

1958

0.0

1982

4.0

1998

3.4

2001

6.3

1976

5.8

2003

6.7

2013

0.0

2011

6.1

2007

4.5

2021

7.8