1994

6.5

1993

5.5

2009

4.8

2017

8.1

2001

7.2

2011

7.3

2014

5.7

2018

5.9

2013

6.3

1901

7.2

2017

7.3

2010

7.0

2021

9.2

2008

6.1

2021

5.3

2005

7.0

1967

7.3

1986

7.6

1989

5.9

1964

7.4