1972

6.2

2017

6.4

1982

6.3

2017

6.6

1985

5.9

1974

6.1

2001

6.2

1999

6.2

1984

4.5

2017

6.1

1992

6.7

2012

8.0

1983

7.2

1987

7.1

2009

5.8

1979

4.8

1975

7.0

1981

6.5

2010

5.6

1993

4.7