1974

6.6

2013

4.2

2018

4.7

1981

7.1

2004

6.5

1993

6.2

1975

7.8

0.0

2007

6.4

2002

5.3

1996

6.7

2001

6.3

1980

4.8

1967

4.4

1975

5.7

2002

6.8

2000

4.5

1996

6.3

1997

6.1

2018

6.3