Table R5.12      Summary of marketable natural gas reserves as of each year-end (109 m3)
Year Changes to initial established reserves Initial established reserves Cumulative production Remaining established reservesa Remaining reserves at 37.4 MJ/m3
New discoveries Development Revisions Net changes
1966       40.7 1 251.0 178.3 1 072.6 1 142.5
1967       73.9 1 324.9 205.8 1 119.1 1 189.6
1968       134.6 1 459.5 235.8 1 223.6 1 289.0
1969       87.5 1 547.0 273.6 1 273.4 1 342.6
1970       46.2 1 593.2 313.8 1 279.4 1 352.0
1971       45.4 1 638.6 362.3 1 276.3 1 346.9
1972       45.2 1 683.9 414.7 1 269.1 1 337.6
1973       183.4 1 867.2 470.7 1 396.6 1 464.5
1974       147.0 2 014.3 527.8 1 486.5 1 550.2
1975       20.8 2 035.1 584.3 1 450.8 1 512.8
1976       105.6 2 140.7 639.0 1 501.7 1 563.9
1977       127.6 2 268.2 700.0 1 568.3 1 630.3
1978       163.3 2 431.6 766.3 1 665.2 1 730.9
1979       123.2 2 554.7 836.4 1 718.4 1 786.2
1980       94.2 2 647.1 900.2 1 747.0 1 812.1
1981       117.0 2 764.1 968.8 1 795.3 1 864.8
1982       118.7 2 882.8 1 029.7 1 853.1 1 924.6
1983       39.0 2 921.8 1 095.6 1 826.2 1 898.7
1984       40.5 2 962.3 1 163.9 1 798.4 1 872.2
1985       42.6 3 004.9 1 236.7 1 768.3 1 840.0
1986       21.8 3 026.7 1 306.6 1 720.1 1 790.3
1987       0.0 3 026.7 1 375.0 1 651.7 1 713.7
1988       64.6 3 091.3 1 463.5 1 627.7 1 673.7
1989       107.8 3 199.0 1 549.3 1 648.7 1 689.2
1990       87.8 3 286.8 1 639.4 1 647.4 1 694.2
1991       57.6 3 344.4 1 718.2 1 626.2 1 669.7
1992       72.5 3 416.9 1 822.1 1 594.7 1 637.6
1993       58.6 3 475.5 1 940.5 1 534.9 1 573.7
1994       74.2 3 549.7 2 059.3 1 490.3 1 526.3
1995       123.0 3 672.7 2 183.9 1 488.8 1 521.8
1996       10.9 3 683.5 2 305.5 1 378.1 1 410.1
1997       33.1 3 716.6 2 432.7 1 283.9 1 314.4
1998       93.0 3 809.6 2 569.8 1 239.9 1 269.3
1999 38.5 40.5 30.7 109.7 3 919.3 2 712.1 1 207.2 1 228.7
2000 50.3 76.5 17.5 144.3 4 063.5 2 852.8 1 210.7 1 221.1
2001 62.5 32.4 21.5 116.4 4 179.9 2 995.5 1 184.4 1 276.8
2002 83.4 60.4 -10.2 133.6 4 313.5 3 142.1 1 171.4 1 258.0
2003 89.4 53.8 -56.0 87.2 4 400.7 3 278.6 1 122.2 1 166.7
2004 55.5 64.5 25.9 145.9 4 546.6 3 419.6 1 127.0 1 172.3
2005 40.4 49.9 35.0 125.7 4 672.4 3 552.4 1 120.0 1 164.0
2006 83.4 48.4 -5.4 126.3 4 798.7 3 683.5 1 115.2 1 136.3
2007 71.0 30.0 -6.4 94.6 4 893.3 3 823.9 1 069.3 1 112.2
2008 69.3 31.3 54.8 155.4 5 048.7 3 950.5 1 098.2 1 142.3
2009 43.1 20.1 18.8 82.0 5 130.7 4 075.0 1 055.7 1 098.0
2010 24.3 25.3 33.2 82.8 5 213.5 4 188.4 1 025.1 1 065.7
2011 20.8 24.0 24.7 69.5 5 283.1 4 338.0 945.1 987.0
2012 16.2 8.0 33.8 58.0 5 341.1 4 425.4 915.7 957.2
2013 20.9 12.4 46.2 79.5 5 420.6 4 523.0 897.5 941.0
2014 13.5 15.5 37.3 66.3 5 486.8 4 621.5 865.3 907.8
2015 7.5 5.5 41.2 54.2 5 541.0 4 711.9 829.1 870.4
2016 3.2 0.8 15.9 19.9 5 560.9 4 802.4 758.4 793.9
a At field plant.