2005

5.2

1986

4.5

1969

3.9

1973

7.0

1972

3.5

1970

3.0

1974

3.8

1971

7.0

1990

2.0

2006

3.5

1993

4.8

2016

4.6

1979

6.0

1977

3.3

1971

4.8

1980

4.3

1983

3.8

1993

3.4

1976

5.3

2008

4.0