2001

7.4

1991

5.9

2006

6.3

2007

6.4

1991

4.7

2012

6.0

1973

3.7

1970

3.8

1966

2.5

2004

5.3

1984

6.5

1980

6.0

2018

2.3

1981

6.8

2006

6.2

1979

7.2

2003

6.6

2013

0.0

1996

7.0

1975

7.5