1999

7.0

1995

4.4

2015

4.3

2009

4.7

2013

6.3

1988

2.0

1977

5.6

1996

5.5

1976

1.0

2000

3.6

2008

5.3

2017

4.0

1973

7.1

1979

0.0

1976

3.3

1972

3.2

1967

5.3

1961

4.3

1976

5.6

1975

5.7