1990

6.9

1992

6.8

2008

8.7

1996

5.4

2004

8.3

2001

7.6

2017

5.7

5.8

2013

7.5

2017

7.0

1998

7.2

2008

6.7

2004

8.6

2018

8.0

2006

6.9

2021

7.4

2019

7.2

2011

6.9

2008

7.6

1990

7.1