The industry grows and shrinks with oil prices.
http://www.macrotrends.net/1369/crude-oil-price-history-chart
From the above, you can make pretty good guesses about when the oil industry and its employment were growing and when they were shrinking.
The industry grows and shrinks with oil prices.
http://www.macrotrends.net/1369/crude-oil-price-history-chart
From the above, you can make pretty good guesses about when the oil industry and its employment were growing and when they were shrinking.