Question: What year did Pietro Ferrero introduce his famous hazelnut cocoa product?

Context articles: Pietro Ferrero Jr.
Giovanni Ferrero
Pietro Ferrero (footballer)
Pietro Ferrero
Pietro Ferrero (anarchist)
Ferrero-Küsschen
Cocoa solids
Ferrero SpA
Nutella
Pietro Ferrero (disambiguation)

Pietro Ferrero (11 September 196318 April 2011) was the joint CEO (with his brother Giovanni) of Italian confectionery company Ferrero SpA, from 1997 until his death in April 2011.
Giovanni Ferrero (born 21 September 1964) is an Italian businessman.
 He assumed the leadership of the confectionery company Ferrero SpA after the death of his brother Pietro Ferrero in 2011.
 He has a net worth of $24.2 billion as of May 2016, according to Bloomberg.
Pietro Ferrero (born April 23, 1905 in Turin) was an Italian professional football player.
Pietro Ferrero (2 September 1898 – 2 March 1949) was the founder of Ferrero SpA, an Italian confectionery and chocolatier company.
 His company invented Nutella, a hazelnut-cream spread, which is now sold in over 160 countries.
 The famous Ferrero Rochers are also made by his company, Ferrero, as were Tic-Tacs and various Kinder chocolates.
Pietro Ferrero (Grugliasco, May 12, 1892 - Turin, December 18, 1922) was an Italian anarchist and trade unionist.
Ferrero Küsschen (meaning little kisses) are Ferrero company chocolates that consist of a whole roasted hazelnut filled with hazelnut cream including vegetable oil and covered in milk chocolate.
Cocoa solids are a mixture of many substances remaining after cocoa butter is extracted from cacao beans.
 When sold as an end product, it may also be called cocoa powder or cocoa.
 Cocoa solids are a key ingredient of chocolate, chocolate syrup, and chocolate confections.
 In contrast, the fatty component of chocolate is cocoa butter.
 Cocoa butter is 50% to 57% of the weight of cocoa beans and gives chocolate its characteristic melting properties.
 Cocoa liquor or cocoa mass is a paste of roasted cocoa beans with cocoa butter and solids in their natural proportions.
 Recipes for chocolate require the addition of extra cocoa butter to cocoa liquor, leading to a cocoa solids surplus and thus a relatively cheap supply of cocoa powder.
 This contrasts with the earliest European usage of cocoa where, before milk and dark chocolate was popularized, cocoa powder was the primary product and cocoa butter was little more than a waste product.
Ferrero SpA (] ) is an Italian manufacturer of branded chocolate and confectionery products and it is the third biggest chocolate producer and confectionery company in the world.
 It was founded in 1946 in Alba, Piedmont, Italy, by Pietro Ferrero, a confectioner and small-time pastry maker who laid the groundwork for Nutella and famously added hazelnut to save money on chocolate.
 The company saw a period of tremendous growth and success under Pietro's son Michele Ferrero, who in turn handed over the daily operations to his sons.
 His son Pietro (the founder's grandson), who oversaw global business, died on April 18, 2011, in a cycling accident in South Africa at the age of 47.
 The Ferrero Group worldwide – now headed by CEO Giovanni Ferrero – includes 38 trading companies, 18 factories, approximately 21,500 employees and produces around 365,000 tonnes of Nutella each year.
 Ferrero International SA's headquarters is in Luxembourg.
 Ferrero SpA is a private company owned by the Ferrero family and has been described as "one of the world's most secretive firms".
 Reputation Institute's 2009 survey ranks Ferrero as the most reputable company in the world.
 The recently announced financial results for the fiscal year ending August 31, 2016 showed consolidated sales growth of 8.2% from the previous fiscal year.
Nutella ( ; ] ) is a brand of sweetened hazelnut cocoa spread manufactured by the Italian company Ferrero that was first introduced in 1965, although its first iteration dates to 1963.
<onlyinclude>* Pietro Ferrero (1898–1949), Italian businessman