1989

7.3

2005

7.1

2014

7.1

2006

8.0

2011

6.3

1989

9.3

2017

6.5

1972

4.0

2018

6.1

1980

6.2

2016

7.0

2020

8.1

1999

5.9

2015

5.6

2020

6.0

2010

4.8

2020

7.0

1998

5.4

2017

6.3

1987

4.1