diff --git a/create_concordance_file.py b/create_concordance_file.py
index 647458b..722fb43 100644
--- a/create_concordance_file.py
+++ b/create_concordance_file.py
@@ -449,10 +449,11 @@ def export_to_csv(pg_cur, table, file_name):
                              to_source, 
                              to_bdy
                 ) TO STDOUT WITH CSV HEADER"""
-    with open(os.path.join(settings.output_path, file_name), "w") as f:
+
+    with open(os.path.join(settings.output_path, file_name), "wb") as f:
         with pg_cur.copy(query) as copy:
-            while data := f.read():
-                copy.write(data)
+            while data := copy.read():
+                f.write(data)
 
 
 if __name__ == "__main__":
diff --git a/data/boundary_concordance_score.csv b/data/boundary_concordance_score.csv
index 5ddecbb..2716825 100644
--- a/data/boundary_concordance_score.csv
+++ b/data/boundary_concordance_score.csv
@@ -1,9 +1,9 @@
 from_source,from_bdy,to_source,to_bdy,concordance_percent,error_percent
 abs 2016,gcc,abs 2021,gccsa,100,
-abs 2016,lga,abs 2016,sa3,74,4.7
+abs 2016,lga,abs 2016,sa3,73,4.7
 abs 2016,lga,abs 2016,ste,100,0.2
 abs 2016,poa,abs 2016,lga,93,1.4
-abs 2016,poa,abs 2016,sa2,62,8.6
+abs 2016,poa,abs 2016,sa2,62,8.7
 abs 2016,sa1,abs 2016,gcc,100,0.0
 abs 2016,sa1,abs 2016,sa2,100,0.0
 abs 2016,sa1,abs 2016,sa3,100,0.0