List of richest Americans in history
By half decade
Table:
Year

Name

Picture

1770
Peter Manigault[10]

1775
Robert Morris[11]

1780
William Bingham[12]

1785
Benjamin Franklin[13]

1790
John Hancock[14]

1795
Elias Hasket Derby[15]

1800
Thomas Willing[16]

1805
Stephen Girard[17]

1810

1815

1820

1825

1830

1835
Stephen Van Rensselaer[18]

1840
John Jacob Astor

1845

1850
Cornelius Vanderbilt[19][20]

1855

1860

1865

1870

1875

1880
William Henry Vanderbilt

1885

1890
John D. Rockefeller[21][22]

1895

1900
Andrew Carnegie

1905

1910
John D. Rockefeller

1915

1920
Henry Ford

1925

1930
Andrew Mellon

1935

1940
Henry Ford[23]

1945

1950
H. L. Hunt[24]

1955
J. Paul Getty

1960
Howard Hughes

1965

1970

1975

1980
Daniel Ludwig

1985
Sam Walton

1990
John Kluge[25]

1995
Bill Gates[26]

2000

2005

2010

2015

From the tabular data covering 'List of richest Americans in history' titled 'By half decade', draft a brief sentence that explains what the highlighted cells show and provide it inside the JSON object {"answer": "YOUR ANSWER"}.