1984

8.1

2004

6.3

1998

6.6

2019

7.5

2007

5.8

2021

6.7

1994

6.6

1995

7.3

2018

6.0

2007

6.1

1996

6.9

2003

5.9

2002

5.6

2004

7.5

1960

6.3

2018

6.9

2006

6.5

2015

4.0

2013

5.0

2014

6.1