1991

0.0

1976

4.1

1997

7.5

1983

4.7

1983

6.1

1982

4.2

2009

6.3

1973

5.6

1974

4.8

1990

4.6

1977

2.0

2006

1.0

1981

5.4

1983

3.5

1981

4.1

1979

5.3

1999

4.0

2000

3.7

2002

6.3

2003

6.8