View History:    Monthly     Annual   
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Midwest (PADD 2) Ending Stocks of Isobutane (Thousand Barrels)
Midwest (PADD 2) Ending Stocks of Isobutane (Thousand Barrels)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  2010 1,911 2,207 2,319 2,130 2,242 2,036 1,921 1,789 1,767 2,225 2,367 1,950
  2011 1,632 1,678 1,883 1,916 2,020 1,943 1,601 1,525 1,620 1,835 1,819 2,022
  2012 2,051 2,314 2,379 2,283 2,437 2,181 1,840 1,749 1,768 2,261 2,350 2,353
  2013 2,278 2,221 1,993 2,284 2,415 1,895 1,909 2,053 1,872 2,087 1,934 1,651
  2014 1,956 1,658 1,955 2,020 2,463 2,660 2,211 2,053 1,734 2,102 2,122 1,931
  2015 1,934 2,129 2,466 2,516 2,443 2,717 2,744 2,436 2,282 1,979 1,985 1,940
  2016 1,953 1,922 2,064 2,114 2,343 2,344 2,369 2,401 2,238 2,082 2,061 1,902
  2017 1,795 1,876 1,889 2,068 2,065 2,032 2,287 2,099 2,297 2,478 2,347 2,160
  2018 2,029 1,968 1,652 1,646 1,975 1,931 2,356 2,290 2,139 1,935 1,842 1,961
  2019 2,553 2,298 2,087 2,443 2,880 2,708 2,475 2,266 2,145 1,979 2,009 1,907
  2020 1,805 1,695 1,960 2,262 1,888 2,074 2,092 2,274 2,668 2,147 1,790 1,889
  2021 2,173 2,019 1,977 2,000 2,176 2,156 2,246 2,022 2,346 2,329 2,441 2,352
  2022 2,213 2,183 2,317 2,352 2,101 1,967 2,035 1,996 2,131 2,181 2,273 2,021
  2023 2,327 2,441 2,315 2,293 2,047 1,784 1,801 1,875 2,296 2,015 2,023 2,104
  2024 2,254 2,271 2,101 2,191 2,294 2,472 2,724 2,590 2,631 2,512 2,365 2,299
  2025 2,148 2,109 2,220 2,309 2,282 2,411 2,427 2,254 2,202 2,144 2,256 2,075

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 2/27/2026
Next Release Date: 3/31/2026

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