1978

7.4

2014

8.5

2016

7.3

2013

6.9

2008

7.7

2001

8.4

2023

7.0

1997

7.9

2019

7.8

1968

8.1

2015

7.6

1994

8.7

2018

7.4

1994

8.5

2002

7.4

2016

6.8

2023

8.1

2016

6.9

2015

7.6

1994

8.5