1992

6.8

1978

7.5

2013

7.1

2017

6.6

1988

8.0

2015

7.4

2000

7.6

1982

7.6

2004

8.1

2020

8.1

2004

8.2

2009

7.0

2011

8.3

1972

7.9

2014

7.3

2000

7.4

1984

7.5

2019

7.6

2014

7.9

2005

8.2