government tax revenue indirectly," said the National Development and Reform Commission. Human rights In 2011, Earthrights International accused PetroChina of complicity in serious human rights abuses in Burma, a country known for militarily furthering its economic interests through the use of forced labor. Corruption In September 2013, Jiang Jiemin, a former chairman of PetroChina, was abruptly removed from his role as director of the State-owned Assets Supervision and Administration Commission of the State Council and investigated for corruption and abuse of power, along with four other senior oil executives. Jiang was considered an ally of corrupt former security chief Zhou Yongkang, and part of a group of officials that had political ties with Zhou. On October 12, 2015, the court found Jiang guilty on all counts, including accepting bribes, possessing dark assets, and abusing his power. He was sentenced to 16 years in prison. In January 2017, former vice chairman Liao Yongyuan was sentenced to 15 years in prison for abuse of power and accepting nearly $2 million worth of bribes. In October 2021, the Central Commission for Discipline Inspection announced that it was investigating former vice president Ling Xiao, for “serious disciplinary violations.” Tax issues In January 2014, the International Consortium of Investigative Journalists published research based on leaked financial records from the British Virgin Islands, implicating CNPC, PetroChina, Sinopec, and CNOOC in offshore tax evasion. Ranking PetroChina was ranked 30th in 2018 Forbes Global 2000, a list of top listed companies of the world. In 2019, PetroChina was ranked 22nd in Forbes Global 2000. Corporate bonds PetroChina, on 24 October 2008 issued a series of medium-term corporate bonds worth 80 billion yuan ($11.7 billion), which was the biggest ever domestic issue by a listed company. Logo The logo of PetroChina has represented the company in plenary capacity since 2004. The logo's basic, abecedarian design consists of a rising sun, projected onto a petal-based graphic. The colors utilized in the graphic are red and yellow, auspicious in Chinese culture. Beneath the English-language version of the design is positioned the company's name in an emboldened, black typeset, "PetroChina" (). PetroChina's current logo was adopted 26 December 2004. The contour of the logo is defined as a "petal graphic equally divided by ten in red and yellow colors", which, according to description, "are the basic colors of the national flag of the People's Republic of China, and which embody the characteristics