1970

8.0

2017

7.7

1998

7.2

1997

7.1

1990

7.9

2016

7.8

2013

6.9

2019

8.2

2001

7.5

2013

8.6

2014

7.9

2017

6.6

2022

6.7

1996

7.7

2006

8.2

1978

7.2

1991

8.0

2000

6.2

2021

6.8

2002

8.4