1992

6.4

2011

6.4

1990

7.0

1995

5.9

1975

7.0

1995

4.6

1998

6.4

2012

7.7

1999

8.4

2013

7.5

2019

7.9

2015

6.6

2009

7.8

2002

5.8

2020

6.4

2001

7.3

2023

6.5

2004

5.9

2010

6.8

2022

8.6