1980

7.2

1998

7.4

1977

6.9

2003

5.9

1966

6.2

2004

7.3

2003

6.6

2021

7.4

2006

5.8

2017

7.5

1997

6.5

2019

8.4

2017

8.3

2007

5.1

2000

6.8

1989

7.2

2008

3.4

2008

7.4

2017

8.6

2017

8.6