1999

7.4

2019

8.5

2002

7.5

2004

6.2

2009

6.4

2010

8.2

2021

7.7

2004

8.9

1998

8.6

2013

7.9

2022

6.0

1977

8.2

2023

8.2

2016

6.8

2001

6.7

2011

8.1

1984

7.7

1966

7.2

2005

7.6

2023

8.4