1991

2.0

2020

6.3

1988

6.6

2015

5.5

2001

7.1

1980

7.8

2008

0.0

2006

7.1

1974

7.7

2002

7.8

2020

5.7

1991

6.7

2017

5.8

1989

2.0

1991

6.5

1986

6.0

2014

8.2

2002

6.4

2007

6.2

2023

7.1