1999

5.7

2014

6.6

2012

7.3

2007

6.9

2004

6.8

2014

6.3

1961

6.2

1978

5.3

2018

7.0

2014

6.5

2002

6.0

2010

5.8

1968

5.0

2006

6.7

2021

5.3

2016

7.3

1998

5.0

1931

7.1

2020

7.7

1985

6.7