2006

5.7

2017

5.5

1988

5.2

1996

7.3

1981

6.5

2012

6.3

1998

6.0

1974

7.0

1983

4.5

1972

6.4

1973

6.3

1995

6.3

5.4

1984

6.1

1999

6.8

1989

6.4

2011

6.6

1979

6.2

1981

6.2