1999

7.3

2012

6.8

2002

6.0

1968

6.2

2017

6.3

2016

5.9

2006

5.3

2017

6.7

2005

5.1

2020

4.4

2006

6.2

1998

6.0

1987

4.5

1988

7.4

1993

3.5

2012

6.4

2008

7.6

2019

6.8

2019

5.8

1985

4.1