United States of America
60 minutes
1987
2015
5.4
2019
4.4
2006
4.7
2002
5.3
6.1
2018
4.8
2016
4.2
2004
5.2
2013
3.7
2021
5.7
1995
6.4
1978
1997
5.5
5.1
2024
0.0
1977
6.0
2014
6.3
1979
6.2
1.0