1984

6.8

2002

6.5

1976

7.0

0.0

2020

5.6

2014

6.5

2012

5.3

1999

7.9

1986

7.9

1990

7.4

1998

7.8

1998

7.1

2003

10.0

2018

7.7

2007

7.5

2008

8.9

2011

8.1

2002

8.1

2009

8.0

2010

7.9