1970

7.3

2004

7.2

1980

7.7

1959

6.1

2006

7.4

2021

6.9

2015

7.5

1986

6.7

2007

4.0

2017

10.0

2017

7.2

1991

2.0

2009

6.2

2003

5.0

1999

6.9

1977

0.0

2009

8.1

2008

5.4

2002

6.5

2007

0.0