The San Antonio Spurs had a defensive rating of 99.7 in 2001-02.

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2002 spurs drtg
TEAMSEASONGPDRTGMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF
San Antonio SpursSan Antonio Spurs2001-028299.7242.196.742.420.07.66.514.435.577.645.85.314.836.220.327.474.219,8557,9323,4731,6436255371,1801,575
StatMuse has team, season-level data for defensive rating going back to the 1973-74 season.