From 1959, mass tourism led to significant growth in the Spanish economy, as well as social change. More than 4 million tourists arrived in Spain in 1959, contributing $128 million to the Spanish economy. The 1960s continued to see a rapid rise in the number of tourists and by 1965, over 14 million tourists were holidaying annually within Spain. This contributed more than $1 billion to the economy. By 1975, more than 30 million tourists spent approximately $3.5 billion.