1971

5.8

1972

4.7

1988

4.6

1991

0.0

1983

2.0

1967

4.0

1990

5.2

1995

4.8

1963

5.9

1987

4.6

1984

5.1

1994

0.0

1983

4.8

1982

6.3

1970

6.1

2008

5.4

1969

6.0

2006

8.2