Natural gas reserves as a share of worldwide reserves rose 4.17% to 0.003% in Bulgaria in 2017, according to EIA.
Historically, natural gas reserves as a share of worldwide reserves in Bulgaria reached an all time high of 0.007% in 1980 and an all time low of 0.003% in 1997. When compared to Bulgaria's main peers, natural gas reserves as a share of worldwide reserves in Greece amounted to < 0.001%, 0.056% in Romania, 0.026% in Serbia and 0.010% in Turkey in 2017.
Bulgaria has been ranked 86th within the group of 97 countries we follow in terms of natural gas reserves as a share of worldwide reserves, 1 place below the position seen 10 years ago.
| Natural Gas Reserves (As % of Worldwide Reserves) | Unit | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 |
| Albania | % | < 0.001% | < 0.001% | < 0.001% | < 0.001% | < 0.001% | ||||||||||||||||
| Bosnia and Herzegovina | % | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... |
| Bulgaria | % | 0.003% | 0.003% | 0.003% | 0.003% | 0.003% | ||||||||||||||||
| Croatia | % | 0.013% | 0.013% | 0.013% | 0.013% | 0.013% | ||||||||||||||||
| Greece | % | < 0.001% | < 0.001% | < 0.001% | < 0.001% | < 0.001% | ||||||||||||||||
| Hungary | % | 0.004% | 0.004% | 0.004% | 0.004% | 0.004% | ||||||||||||||||
| Iran | % | 15.6% | 17.2% | 17.3% | 17.1% | 18.0% | ||||||||||||||||
| Iraq | % | 1.67% | 1.64% | 1.63% | 1.60% | 1.67% | ||||||||||||||||
| Moldova | % | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... |
| North Macedonia | % | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... |
| Romania | % | 0.033% | 0.033% | 0.054% | 0.053% | 0.056% | ||||||||||||||||
| Serbia | % | ... | ... | ... | ... | ... | ... | ... | ... | ... | 0.025% | 0.025% | 0.025% | 0.024% | 0.025% | |||||||
| Turkey | % | 0.003% | 0.003% | 0.003% | 0.003% | 0.003% | ||||||||||||||||
| Ukraine | % | 0.581% | 0.573% | 0.570% | 0.559% | 0.584% |