Write a question about the following article: The United States has also conducted a series of military strikes on al-Qaeda militants in Yemen since the War on Terror began. Yemen has a weak central government and a powerful tribal system that leaves large lawless areas open for militant training and operations. Al-Qaeda has a strong presence in the country. On 31 March 2011, AQAP declared the Al-Qaeda Emirate in Yemenafter its captured most of Abyan Governorate. The U.S., in an effort to support Yemeni counter-terrorism efforts, has increased their military aid package to Yemen from less than $11 million in 2006 to more than $70 million in 2009, as well as providing up to $121 million for development over the next three years.

Question about the article:
How many minimum in millions more was military aid package to Yemen increased by on 2006 through 2009?