1997

6.9

2019

8.3

2018

5.8

2009

6.7

2019

6.2

2008

5.9

1992

6.4

2011

6.5

1995

7.8

2016

7.3

2021

8.7

1997

6.0

1988

7.6

2011

7.3

2011

6.1

2016

6.9

2009

5.7

1992

6.1

2014

6.3

1984

6.6