1990

6.2

1991

6.8

1992

6.2

2016

7.0

2019

4.0

2023

6.4

2015

6.0

2014

6.4

2013

5.0

1972

7.7

2005

7.4

1981

7.1

2006

7.3

2004

7.8

2023

6.0

1916

6.2

2009

6.3

2001

5.9

1964

6.2

2001

7.2