During World War II, the steel mills in the city of Chicago alone accounted for 20% of all steel production in the United States and 10% of global production. The city produced more steel than the United Kingdom during the war, and surpassed Nazi Germany's output in 1943 (after barely missing in 1942). Some mills were located on the branches of the Chicago River emanating from the downtown area, but the largest mills were located along the Calumet River and Lake Calumet in the far south of the city. Over 200,000 people were employed in the steel industry at its peak in the 1950s and 1960s, but mass layoffs in the 1970s and 1980s devastated many working class south side neighborhoods that were heavily dependent on industrial jobs. Downsizing and plant closures continued into the 1990s and 2000s, and the US Dept of Commerce estimates that today fewer than 25,000 people are employed in the steel industry in the Chicago–Joliet–Naperville, IL–IN–WI Metropolitan Statistical Area (18,000 of whom are actually in Northwest Indiana.