1998

6.7

2008

7.5

2004

8.3

1978

8.1

1993

7.6

1999

8.2

2004

6.2

2012

6.9

1989

7.8

2012

4.0

2011

7.7

2020

7.0

1975

7.5

2019

0.0

2020

3.5

1980

7.8

1999

7.1

2000

6.8

2013

8.3

2017

5.0