Millions of Us

5.1

/

2015

9.6

/

2011

6.8

/

2004

8.3

/

2024

6.607

/

2014

7.5

/

2008

7

/

2021

6.5

/

1987

7

/

2010

7.1

/

2011

7

/

2019

4.9

/

1993

6.2

/

2025

6.2

/

2016

5

/

2003

6

/

1998

5

/

1954

6.2

/

NaN