Passage: Local engineer Heitor da Silva Costa designed the statue. French sculptor Paul Landowski created the work.In 1922, Landowski commissioned fellow Parisian Romanian sculptor Gheorghe Leonida, who studied sculpture at the Fine Arts Conservatory in Bucharest and in Italy.A group of engineers and technicians studied Landowski's submissions and felt building the structure of reinforced concrete (designed by Albert Caquot) instead of steel was more suitable for the cross-shaped statue. The concrete making up the base was supplied from Limhamn, Sweden. The outer layers are soapstone, chosen for its enduring qualities and ease of use. Construction took nine years, from 1922 to 1931 and cost the equivalent of US$250,000 (equivalent to $3,500,000 in 2018) and the monument opened on October 12, 1931. During the opening ceremony, the statue was to be lit by a battery of floodlights turned on remotely by Italian shortwave radio inventor Guglielmo Marconi, stationed 9,200 kilometres (5,700 mi) away in Rome but because of bad weather, the lights were activated on-site.In October 2006, on the 75th anniversary of the statue's completion, Archbishop of Rio, Cardinal Eusebio Oscar Scheid, consecrated a chapel, named after Brazil's patron saint—Our Lady of the Apparition, under the statue, allowing Catholics to hold baptisms and weddings there.Lightning struck the statue during a violent thunderstorm on February 10, 2008, causing some damage to the fingers, head and eyebrows. The Rio de Janeiro state government initiated a restoration effort to replace some of the outer soapstone layers and repair the lightning rods on the statue. Lightning damaged it again, on January 17, 2014, dislodging a finger on the right hand.In 2010, a massive restoration of the statue began. Work included cleaning, replacing the mortar and soapstone on the exterior, restoring iron in the internal structure, and waterproofing the monument. Vandals attacked the statue during renovation, spraying paint along the arm. Mayor Eduardo Paes called the act "a...

Question: How many years did it take to construct it?
nine