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Established natural gas reserves (Billion cubic metres)
| 1970 | 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
| Nova Scotia | | | 67 | 15 | 8 | 5 | 3 | 4 | 3 | 1 | 1 | 1 | 1 | 0 | | | |
| Ontario | 9 | 17 | 12 | 13 | 19 | 19 | 7 | 7 | 6 | 7 | 19 | 19 | 19 | 19 | 19 | 19 | 18 |
| Saskatchewan | 29 | 84 | 76 | 92 | 58 | 53 | 52 | 51 | 52 | 49 | 43 | 40 | 36 | 36 | 14 | 11 | 7 |
| Alberta | 1,279 | 1,647 | 1,211 | 1,086 | 1,025 | 945 | 916 | 898 | 865 | 829 | 758 | 749 | 781 | 749 | 726 | 683 | 663 |
| British Columbia | 244 | 230 | 250 | 348 | 782 | 806 | 949 | 1,001 | 998 | 1,217 | 1,170 | 1,259 | 1,242 | 1,652 | 1,697 | 1,888 | 2,099 |