1983

7.0

1997

5.9

2019

7.9

2003

6.5

2017

4.3

2016

4.5

2018

5.0

1996

6.8

2005

6.2

2014

6.3

2002

4.5

2019

7.2

2012

5.6

1976

5.6

2000

6.7

1993

6.9

2001

7.1

2019

2.0

1974

2.8

2019

2.0