1999

7.4

2004

7.1

1999

7.9

2007

9.5

2003

8.0

1982

7.3

2015

7.6

2010

6.7

2004

7.5

2019

8.0

2009

7.7

2016

10.0

2014

8.1

2016

5.6

1997

6.4

1991

4.8

2018

7.1

2008

6.0

2020

7.3

1982

6.9