1997

6.1

1984

5.6

2019

5.9

2008

6.9

1949

6.0

2007

5.6

2015

7.7

1995

6.7

2005

6.7

2008

5.9

2009

6.4

2006

5.3

2009

5.3

1960

7.1

2008

5.3

1968

9.0

2008

6.2

2000

5.7

2012

6.5

2024

10.0