1997

6.3

2015

7.7

1999

8.4

1988

6.2

2010

8.4

2018

8.2

2017

7.5

2001

7.8

2019

8.1

1977

8.2

2003

7.2

2021

7.5

2017

8.1

1994

8.7

2001

7.9

1998

7.8

2000

8.2

2017

8.1

2015

7.5

2021

7.8