1981

5.2

1980

0.0

2002

3.4

1974

4.0

1972

5.0

1977

6.3

1992

5.6

1987

7.3

1994

7.0

1995

8.2

2000

0.0

2007

1.0

2015

0.0

1970

6.1

1996

5.5

2010

6.2

1999

1.0