2017

4.5

1975

4.4

1986

6.3

1979

6.2

1981

5.9

1982

5.7

1987

5.3

1995

5.1

2008

5.1

1976

4.9

1972

4.3

1971

4.5

2004

5.5

1982

6.6

1998

6.6

2003

4.6

2000

5.8

1986

5.0

1988

6.7

2007

4.4