1979

7.0

1997

7.3

2013

8.1

2017

7.8

2004

6.5

2011

7.2

2016

6.2

2005

8.5

2019

10.0

2015

7.1

1995

7.6

1990

7.8

2001

7.0

1988

7.2

2020

7.6

1998

4.5

2002

8.5

2016

2.0