Question: What portion of the GNP is represented by education?
About the article "Tunisia", section "Education".

Candidate passages:
However, in “The Green National Product,” Clifford Cobb and John Cobb argue that the Measure of Economic Welfare failed to encompass the depletion of natural capital.
In 1989 Herman Daly, John Cobb, and Clifford Cobb created what is known as the Index of Sustainable Economic Welfare (ISEW).
This new measurement of welfare was created in the hopes that it would replace the flawed GNP.
Herman Daly stated that the key flaw of the traditional GNP was that it ignored core accounting principles of business where all revenues and expenses are allocated to income.
ISEW called for ecological and economic sustainability to coincide since the economy is ultimately dependent on the natural resources that the earth provides.
Rather than the original GNP, ISEW takes into account costs that are naturally unsustainable.
By creating ISEW, they wanted to expand the current national product so that individuals, businesses, and governments could take actions that will generally enhance welfare instead of just the traditional GNP. 
Private Product Remaining or PPR is a means of national income accounting similar to the more commonly encountered GNP.
Since government is financed through taxation and any resulting output is not (usually) sold on the market, what value is ascribed to it is disputed (see calculation problem), and it is counted in GNP.
Murray Rothbard developed the GPP (Gross Private Product) and PPR measures.
GPP is GNP minus income originating in government and government enterprises.
PPR is GPP minus the higher of government expenditures and tax revenues plus interest received.
For example, in an economy in which the private expenditures total $1,000 and government expenditures total $200, the GNP would be $1,200, GPP would be $1,000, and PPR would be $800. 
Gross National Product (GNP) is often contrasted with Gross Domestic Product (GDP).
While GNP measures the output generated by a country's enterprises (whether physically located domestically or abroad) GDP measures the total output produced within a country's borders - whether produced by that country's own local firms or by foreign firms.
When a country's capital or labour resources are employed outside its borders, or when a foreign firm is operating in its territory, GDP and GNP can produce different measures of total output.
In 2009 for instance, the United States estimated its GDP at $14.119 trillion, and its GNP at $14.265 trillion. 
 The GNP has records of secretly hiring and paying university students to generate online replies favorable to the GNP.
GNP member Jin Seong-ho (진성호) formally apologized on July 2, 2009 for making a remark that "the GNP occupied Naver".
Naver is one of the biggest South Korean internet portals.
Seoul Metropolitan Election Commission reported unregistered Park Geun-hye's election camp run by Yun Jeong-hun to the Seoul Central Prosecutors' Office on charges of violating the public election law especially by using fake Twitter accounts and bloggers.
Yun Jeong-hun was a pastor and dismissed for inappropriate remarks such as anti-gay ones.  
Bowley formulated Bowley's law, which says that the proportion of GNP from labour is constant.