2005

3.8

2011

3.3

1971

4.8

1978

6.4

2009

4.0

1975

5.2

1979

6.9

2003

5.0

1983

5.0

1973

3.1

1997

4.7

1998

4.0

2008

2.0

1972

4.1

1979

4.3

1984

5.5

2018

4.5

1976

7.0

2017

4.5

1977

6.3

2008

5.5

2019

6.0

1984

4.3