diff --git a/iam_units/data/definitions.txt b/iam_units/data/definitions.txt
index c53ab93..a4d86fe 100644
--- a/iam_units/data/definitions.txt
+++ b/iam_units/data/definitions.txt
@@ -59,9 +59,33 @@ USD_2005 = 0.8038 * EUR_2005 = USD
 
 # United States' GDP deflator, data from
 # https://data.worldbank.org/indicator/NY.GDP.DEFL.ZS?locations=US
-
-USD_2010 = USD_2005 * 83.426 / 91.718
-
+# last update: 2023-06-29
+
+USD_2015 = USD_2005 * 0.8358
+
+USD_2000 = USD_2015 / 0.7453
+USD_2001 = USD_2015 / 0.7621
+USD_2002 = USD_2015 / 0.774
+USD_2003 = USD_2015 / 0.7892
+USD_2004 = USD_2015 / 0.8104
+# USD_2005 = USD_2015 / 0.8358
+USD_2006 = USD_2015 / 0.8616
+USD_2007 = USD_2015 / 0.8849
+USD_2008 = USD_2015 / 0.9019
+USD_2009 = USD_2015 / 0.9077
+USD_2010 = USD_2015 / 0.9186
+USD_2011 = USD_2015 / 0.9377
+USD_2012 = USD_2015 / 0.9552
+USD_2013 = USD_2015 / 0.9719
+USD_2014 = USD_2015 / 0.9901
+# USD_2015
+USD_2016 = USD_2015 / 1.01
+USD_2017 = USD_2015 / 1.0292
+USD_2018 = USD_2015 / 1.054
+USD_2019 = USD_2015 / 1.0729
+USD_2020 = USD_2015 / 1.0869
+USD_2021 = USD_2015 / 1.1357
+USD_2022 = USD_2015 / 1.2152
 
 # Transportation activity
 
diff --git a/iam_units/update.py b/iam_units/update.py
index a71c6fc..87e9eb3 100644
--- a/iam_units/update.py
+++ b/iam_units/update.py
@@ -100,7 +100,7 @@ def emissions():
 
     # Format and write the species defs file
     lines = [_EMI_HEADER]
-    for (species, alias) in _EMI_EQUIV.items():
+    for species, alias in _EMI_EQUIV.items():
         lines.extend(
             f"a_{a} = {factor or ''}a_{species}" for a, factor in alias.items()
         )