1986

7.6

1990

6.1

2009

5.7

2003

5.5

2003

6.1

2014

6.6

2011

6.5

2006

5.8

1943

6.9

2011

6.2

2016

4.2

2015

6.4

2021

7.5

1989

7.0

2012

6.8

1960

6.5

2004

5.7

2007

7.4

1992

7.2

2010

4.6