1988

7.2

2018

10.0

2017

3.9

2017

5.0

1991

6.7

1992

5.2

1999

5.7

2000

2.9

1977

4.6

1982

3.2

1987

3.1

1980

2.5

1983

3.4

1937

0.0

1984

4.7

1992

7.0

1996

6.5

2002

6.2

2012

2.0

1982

6.8