1990

5.8

1985

7.1

2011

6.4

2006

5.3

2007

6.3

2024

4.8

2002

9.5

1981

7.4

2023

8.5

2003

4.0

1985

6.1

1971

6.4

2022

6.0

2010

8.2

2015

6.5

2013

8.6

2014

7.7

1999

8.4

1972

10.0

1920

6.4